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-45+3(2x-4)=3x+3
We move all terms to the left:
-45+3(2x-4)-(3x+3)=0
We multiply parentheses
6x-(3x+3)-12-45=0
We get rid of parentheses
6x-3x-3-12-45=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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