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7x+12+3x+13=2x+12
We move all terms to the left:
7x+12+3x+13-(2x+12)=0
We add all the numbers together, and all the variables
10x-(2x+12)+25=0
We get rid of parentheses
10x-2x-12+25=0
We add all the numbers together, and all the variables
8x+13=0
We move all terms containing x to the left, all other terms to the right
8x=-13
x=-13/8
x=-1+5/8
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