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2(2x+3)-3(x+4)=15
We move all terms to the left:
2(2x+3)-3(x+4)-(15)=0
We multiply parentheses
4x-3x+6-12-15=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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