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8x+13=3x-10=12x-6
We move all terms to the left:
8x+13-(3x-10)=0
We get rid of parentheses
8x-3x+10+13=0
We add all the numbers together, and all the variables
5x+23=0
We move all terms containing x to the left, all other terms to the right
5x=-23
x=-23/5
x=-4+3/5
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