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45-(3x+9)=3x+15+x
We move all terms to the left:
45-(3x+9)-(3x+15+x)=0
We add all the numbers together, and all the variables
-(3x+9)-(4x+15)+45=0
We get rid of parentheses
-3x-4x-9-15+45=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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