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