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8x+3(x-12)=4x+15
We move all terms to the left:
8x+3(x-12)-(4x+15)=0
We multiply parentheses
8x+3x-(4x+15)-36=0
We get rid of parentheses
8x+3x-4x-15-36=0
We add all the numbers together, and all the variables
7x-51=0
We move all terms containing x to the left, all other terms to the right
7x=51
x=51/7
x=7+2/7
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