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-3(x+10)+6x=-12
We move all terms to the left:
-3(x+10)+6x-(-12)=0
We add all the numbers together, and all the variables
6x-3(x+10)+12=0
We multiply parentheses
6x-3x-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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