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7x+12=x-6-18
We move all terms to the left:
7x+12-(x-6-18)=0
We add all the numbers together, and all the variables
7x-(x-24)+12=0
We get rid of parentheses
7x-x+24+12=0
We add all the numbers together, and all the variables
6x+36=0
We move all terms containing x to the left, all other terms to the right
6x=-36
x=-36/6
x=-6
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