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2x+3(x-1)=4x+12
We move all terms to the left:
2x+3(x-1)-(4x+12)=0
We multiply parentheses
2x+3x-(4x+12)-3=0
We get rid of parentheses
2x+3x-4x-12-3=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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