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