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3x+2(x-6)=2x-30
We move all terms to the left:
3x+2(x-6)-(2x-30)=0
We multiply parentheses
3x+2x-(2x-30)-12=0
We get rid of parentheses
3x+2x-2x+30-12=0
We add all the numbers together, and all the variables
3x+18=0
We move all terms containing x to the left, all other terms to the right
3x=-18
x=-18/3
x=-6
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