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12x-2x+15=3-6+x
We move all terms to the left:
12x-2x+15-(3-6+x)=0
We add all the numbers together, and all the variables
12x-2x-(x-3)+15=0
We add all the numbers together, and all the variables
10x-(x-3)+15=0
We get rid of parentheses
10x-x+3+15=0
We add all the numbers together, and all the variables
9x+18=0
We move all terms containing x to the left, all other terms to the right
9x=-18
x=-18/9
x=-2
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