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3x-6(2x+3)=12
We move all terms to the left:
3x-6(2x+3)-(12)=0
We multiply parentheses
3x-12x-18-12=0
We add all the numbers together, and all the variables
-9x-30=0
We move all terms containing x to the left, all other terms to the right
-9x=30
x=30/-9
x=-3+1/3
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