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a)26 + 5x = 3x + 56
5x – 3x = 56 – 26
2x = 30
x = 30 : 2 = 15
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26 + 5 x = 3 x + 56 => 5x - 3x = 56 - 26 . suy ra : 2x = 30 . x = 30 : 2 = 15
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Đáp án: B
25+5x= 5 6 : 5 3
25+5x=53
25+5x=125
5x=125-25
5x=100
x=100:5
x=20
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Ta có:2x+14=56-5x
2x+14-56+5x=0
7x-42=0
7x=42
x=6
Vậy x=6
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a)x=243:3 b) 5x=56:625 c)2x=128:24 d)3x+2=18:2
x=81 5x=28/263 2x=16/3 3x+2=9
x=28/263:5 x=16/3:2 3x=9-2
x=28/1315 x=8/3 3x=7=>x=7/3
a) 3x = 243
x = 243 : 3
x = 81
b ) 56 : 5x = 625
5x = 56 : 625
5x = 56/625
x = 56/625 : 5
x = 56/3125
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\(1,\Leftrightarrow7x=42\Leftrightarrow x=6\\ 2,\Leftrightarrow36-4x=4\Leftrightarrow4x=32\Leftrightarrow x=8\\ 3,\Leftrightarrow3x=35\Leftrightarrow x=\dfrac{35}{3}\\ 4,\Leftrightarrow x-12=144\Leftrightarrow x=156\\ 5,\Leftrightarrow x-14=16\Leftrightarrow x=30\\ 6,\Leftrightarrow3x-24=\dfrac{148}{73}\Leftrightarrow3x=\dfrac{1900}{73}\Leftrightarrow x=\dfrac{1900}{219}\\ 7,\Leftrightarrow33+x=45\Leftrightarrow x=12\\ 8,Sai.đề\\ 9,\Leftrightarrow\left(x+9\right):2=39\Leftrightarrow x+9=78\Leftrightarrow x=69\\ 11,\Leftrightarrow2\left(x+7\right)=38\Leftrightarrow x+7=19\Leftrightarrow x=12\\ 13,\Leftrightarrow2\left(x-51\right)=66\Leftrightarrow x-51=33\Leftrightarrow x=84\)
\(15,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ 17,\Leftrightarrow\left(x-3\right):2=48\Leftrightarrow x-3=96\Leftrightarrow x=99\\ 19,\Leftrightarrow0x=46\Leftrightarrow x\in\varnothing\\ 8,Sai.đề\\ 14,\Leftrightarrow2x=209\Leftrightarrow x=\dfrac{209}{2}\\ 16,\Leftrightarrow2x+6=157\Leftrightarrow2x=151\Leftrightarrow x=\dfrac{151}{2}\\ 18,\Leftrightarrow5\left(x+4\right)=100\Leftrightarrow x+4=20\Leftrightarrow x=16\\ 20,\Leftrightarrow\left(3x-5\right)^3=27=3^3\Leftrightarrow3x-5=3\Leftrightarrow x=\dfrac{8}{3}\)
26 + 5x = 3x - 56
5x - 3x = 56 - 26
5x - 3x = 30
2x = 30
x = 30 : 2
x = 15
26+5x=3x-56
=> 5x-3x=-56-26
=> 2x=-82
=> x=-82:2
=> x=-41