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(3x+18)+(3x+18)=9x-15
We move all terms to the left:
(3x+18)+(3x+18)-(9x-15)=0
We get rid of parentheses
3x+3x-9x+18+18+15=0
We add all the numbers together, and all the variables
-3x+51=0
We move all terms containing x to the left, all other terms to the right
-3x=-51
x=-51/-3
x=+17
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