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15x+12-3x=2x-84+x
We move all terms to the left:
15x+12-3x-(2x-84+x)=0
We add all the numbers together, and all the variables
15x-3x-(3x-84)+12=0
We add all the numbers together, and all the variables
12x-(3x-84)+12=0
We get rid of parentheses
12x-3x+84+12=0
We add all the numbers together, and all the variables
9x+96=0
We move all terms containing x to the left, all other terms to the right
9x=-96
x=-96/9
x=-10+2/3
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