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6x+15=9x+18
We move all terms to the left:
6x+15-(9x+18)=0
We get rid of parentheses
6x-9x-18+15=0
We add all the numbers together, and all the variables
-3x-3=0
We move all terms containing x to the left, all other terms to the right
-3x=3
x=3/-3
x=-1
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