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15x+15=18x+9
We move all terms to the left:
15x+15-(18x+9)=0
We get rid of parentheses
15x-18x-9+15=0
We add all the numbers together, and all the variables
-3x+6=0
We move all terms containing x to the left, all other terms to the right
-3x=-6
x=-6/-3
x=+2
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