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-4(-5x+5)=-100
We move all terms to the left:
-4(-5x+5)-(-100)=0
We add all the numbers together, and all the variables
-4(-5x+5)+100=0
We multiply parentheses
20x-20+100=0
We add all the numbers together, and all the variables
20x+80=0
We move all terms containing x to the left, all other terms to the right
20x=-80
x=-80/20
x=-4
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