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-9x=-12x+45
We move all terms to the left:
-9x-(-12x+45)=0
We get rid of parentheses
-9x+12x-45=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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