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15x+18=-9+18x
We move all terms to the left:
15x+18-(-9+18x)=0
We add all the numbers together, and all the variables
15x-(18x-9)+18=0
We get rid of parentheses
15x-18x+9+18=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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