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-4(5-5x)=140
We move all terms to the left:
-4(5-5x)-(140)=0
We add all the numbers together, and all the variables
-4(-5x+5)-140=0
We multiply parentheses
20x-20-140=0
We add all the numbers together, and all the variables
20x-160=0
We move all terms containing x to the left, all other terms to the right
20x=160
x=160/20
x=8
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