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(3x+18)*2=9x-15
We move all terms to the left:
(3x+18)*2-(9x-15)=0
We multiply parentheses
6x-(9x-15)+36=0
We get rid of parentheses
6x-9x+15+36=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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