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(2x+9)+(2x+9)=6x-18
We move all terms to the left:
(2x+9)+(2x+9)-(6x-18)=0
We get rid of parentheses
2x+2x-6x+9+9+18=0
We add all the numbers together, and all the variables
-2x+36=0
We move all terms containing x to the left, all other terms to the right
-2x=-36
x=-36/-2
x=+18
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