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12x+13+2x=-13+12x
We move all terms to the left:
12x+13+2x-(-13+12x)=0
We add all the numbers together, and all the variables
12x+2x-(12x-13)+13=0
We add all the numbers together, and all the variables
14x-(12x-13)+13=0
We get rid of parentheses
14x-12x+13+13=0
We add all the numbers together, and all the variables
2x+26=0
We move all terms containing x to the left, all other terms to the right
2x=-26
x=-26/2
x=-13
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