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12x+3(3x+6)=x+8
We move all terms to the left:
12x+3(3x+6)-(x+8)=0
We multiply parentheses
12x+9x-(x+8)+18=0
We get rid of parentheses
12x+9x-x-8+18=0
We add all the numbers together, and all the variables
20x+10=0
We move all terms containing x to the left, all other terms to the right
20x=-10
x=-10/20
x=-1/2
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