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6(-x+3)+3x=-3
We move all terms to the left:
6(-x+3)+3x-(-3)=0
We add all the numbers together, and all the variables
6(-1x+3)+3x-(-3)=0
We add all the numbers together, and all the variables
3x+6(-1x+3)+3=0
We multiply parentheses
3x-6x+18+3=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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