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4(3x-15)=120
We move all terms to the left:
4(3x-15)-(120)=0
We multiply parentheses
12x-60-120=0
We add all the numbers together, and all the variables
12x-180=0
We move all terms containing x to the left, all other terms to the right
12x=180
x=180/12
x=15
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