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3(6-3x)=-45
We move all terms to the left:
3(6-3x)-(-45)=0
We add all the numbers together, and all the variables
3(-3x+6)-(-45)=0
We add all the numbers together, and all the variables
3(-3x+6)+45=0
We multiply parentheses
-9x+18+45=0
We add all the numbers together, and all the variables
-9x+63=0
We move all terms containing x to the left, all other terms to the right
-9x=-63
x=-63/-9
x=+7
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