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12+5x=3x-26
We move all terms to the left:
12+5x-(3x-26)=0
We get rid of parentheses
5x-3x+26+12=0
We add all the numbers together, and all the variables
2x+38=0
We move all terms containing x to the left, all other terms to the right
2x=-38
x=-38/2
x=-19
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