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12x-35=7x+15
We move all terms to the left:
12x-35-(7x+15)=0
We get rid of parentheses
12x-7x-15-35=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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