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9x+-27=12x+45
We move all terms to the left:
9x+-27-(12x+45)=0
We add all the numbers together, and all the variables
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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