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-6x+3(3x+7)=6
We move all terms to the left:
-6x+3(3x+7)-(6)=0
We multiply parentheses
-6x+9x+21-6=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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