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6x-12=-3x+69
We move all terms to the left:
6x-12-(-3x+69)=0
We get rid of parentheses
6x+3x-69-12=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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