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5x-5(-3x+4)=120
We move all terms to the left:
5x-5(-3x+4)-(120)=0
We multiply parentheses
5x+15x-20-120=0
We add all the numbers together, and all the variables
20x-140=0
We move all terms containing x to the left, all other terms to the right
20x=140
x=140/20
x=7
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