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4(5x-20)=-9x
We move all terms to the left:
4(5x-20)-(-9x)=0
We multiply parentheses
20x-(-9x)-80=0
We get rid of parentheses
20x+9x-80=0
We add all the numbers together, and all the variables
29x-80=0
We move all terms containing x to the left, all other terms to the right
29x=80
x=80/29
x=2+22/29
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