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