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a . 3x+(-24)= -9-(2x)
= 3x+(-24) = -9 +( -2x)
= 3x + 2x = -9 + 24
= 5x = 15
x = 15 : 5
x = 3
b .80+(5x)=9+(-20)
= 80 + 5x = -11
5x = -11 - 80
5x = -91
x = -91 : 5
x = -18,2 = \(\dfrac{-91}{5}\)
x
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l) (3x – 6) .3 = 34
⇒ ( 3x-6) = 34:3= 33
⇒ 3x = 27 + 6=33 ⇒x=11
m) (5x – 24) .38 = 2.311
⇒ ( 5x-24).38=622
⇒ 5x-24=622:38 ⇒\(\dfrac{311}{19}\)
⇒ x =\(\left(\dfrac{311}{19}+24\right)\):5
⇒ x=\(\dfrac{767}{95}\)
n) 3x = 9
⇒ x = 9:3 ⇒ 3
p) 4x = 64
⇒ x = 64 :4 ⇒16
q) 2x = 16
⇒ x= 16 : 2 ⇒ 8
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1: =>\(5^{x-2}-9=2^4-\left(6^2-6^2\right)\)
=>\(5^{x-2}=16+9=25\)
=>x-2=2
=>x=4
2: \(\Leftrightarrow3^x+16=19^6:19^5-3=19-3=16\)
=>3^x=0
=>x=0
3: \(\Leftrightarrow2^x+2^x\cdot16=272\)
=>2^x*17=272
=>2^x=16
=>x=4
4: \(\Leftrightarrow2^{x-1}+3=24-\left(4^2-2^2+1\right)=24-\left(16-4+1\right)\)
=>\(2^{x-1}+3=24-16+4-1=8+4-1=12-1=11\)
=>2^x-1=8
=>x-1=3
=>x=4
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18 - 4\(x\) = -20 - 6\(x\)
-4\(x\) + 6\(x\) = - 20 - 18
2\(x\) = - 38
\(x\) = - 19
h, -15 \(\times\) 24 = -7\(x\) + 32
7\(x\) = 360 + 32
7\(x\) = 392
\(x\) = 392:7
\(x\) = 56
i, 15\(x\) -3.(4\(x\) - 6) = -12 + 36
15\(x\) - 12\(x\) + 18 = 24
3\(x\) = 24 - 18
3\(x\) = 6
\(x\) = 2
k, -10\(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) = -20
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a)(2x+4).8-40=24
(2x+4).8=24+40
(2x+4).8=64
2x+4=64:8
2x+4=8
2x=8+4
2x=12
x=12:2
x=6
b)(2x+42)-8=64:2
(2x+16)-8=32
2x+16=32+8
2x+16=40
2x=40-16
2x=24
x=24:2
x=12
c)(3x+2).4-20=24
(3x+2).4=24+20
(3x+2).4=44
3x+2=44:4
3x+2=11
3x=11-2
3x=9
x=9:3
x=3
\(5x-\left(24-2x\right)=\left(-24\right)+20+3x\)
\(5x+\left(-24\right)+2x=\left(-24\right)+20+3x\)
\(7x+\left(-24\right)=\left(-24\right)+20+3x\)
\(7x=20+3x\)
\(\left(7-3\right)x=20\)
\(4x=20\)
\(x=20:4\)
\(x=5\)
5x- (24 - 2x) = -24 + 20 + 3x
5x- 24 + 2x = -4 + 3x
5x + 2x - 3x = 24 - 4
4x = 20
x = 20 \(\div\)4
x = 5
Vậy x = 5