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12x+7=8x+47
We move all terms to the left:
12x+7-(8x+47)=0
We get rid of parentheses
12x-8x-47+7=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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