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(7x+12)+(2x-7)+(15x+8)=387
We move all terms to the left:
(7x+12)+(2x-7)+(15x+8)-(387)=0
We get rid of parentheses
7x+2x+15x+12-7+8-387=0
We add all the numbers together, and all the variables
24x-374=0
We move all terms containing x to the left, all other terms to the right
24x=374
x=374/24
x=15+7/12
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