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7x+12=15x-36
We move all terms to the left:
7x+12-(15x-36)=0
We get rid of parentheses
7x-15x+36+12=0
We add all the numbers together, and all the variables
-8x+48=0
We move all terms containing x to the left, all other terms to the right
-8x=-48
x=-48/-8
x=+6
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