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8x+61=15x+12
We move all terms to the left:
8x+61-(15x+12)=0
We get rid of parentheses
8x-15x-12+61=0
We add all the numbers together, and all the variables
-7x+49=0
We move all terms containing x to the left, all other terms to the right
-7x=-49
x=-49/-7
x=+7
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