52x = 520 : 510
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5-2x = 3x -20
5+20 = 2x + 3x
25 = 5x
x = 25 : 5
x = 5
b) ( x - 2/5 ) : 9/10 = 5/3
x- 2/5 = 5/3 . 9/10
x- 2/5 = 1
x = 1 + 2/5
x = 7/5
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a) x = 2.
b) x = 7.
c) x= 12.
d) x= 45.
e) x = 18.
f) x = 10.
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1) 4x-(2x-5)=21
4x-2x+5=21
2x+5=21
2x=21 -5
2x=16
x=16/2
x=8
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\(A=\frac{\left(x^2+2x\right)x+\left(x-5\right)2\left(x+5\right)+20-5x}{2x\left(x+5\right)}\)
\(A=\frac{x^3+2x^2+2x^2-50+20-5x}{2x\left(x+5\right)}\)
\(A=\frac{x^3+4x^2-5x-30}{2x\left(x+5\right)}\)
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\(-4\left(x-10\right)+5=-2x-\left(x+7\right)-\left(-20+8\right)\)
\(\Leftrightarrow-4x+40+5=-2x-x-7+20-8\)
\(\Leftrightarrow-4x+2x+x=-40-5-7-20-8\)
\(\Leftrightarrow-x=-80\)
\(\Leftrightarrow x=80\)
Vậy...
−4(x−10)+5=−2x−(x+7)−(−20+8)−4(x−10)+5=−2x−(x+7)−(−20+8)
⇔−4x+40+5=−2x−x−7+20−8⇔−4x+40+5=−2x−x−7+20−8
⇔−4x+2x+x=−40−5−7−20−8⇔−4x+2x+x=−40−5−7−20−8
⇔−x=−80⇔−x=−80
⇔x=80⇔x=80
52x = 520 : 510
=> 52x = 510
=> 2x = 10
=> x = 5