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12x-10x=x+15
We move all terms to the left:
12x-10x-(x+15)=0
We add all the numbers together, and all the variables
2x-(x+15)=0
We get rid of parentheses
2x-x-15=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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