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(13x+10)+(6x-9)=18x+15
We move all terms to the left:
(13x+10)+(6x-9)-(18x+15)=0
We get rid of parentheses
13x+6x-18x+10-9-15=0
We add all the numbers together, and all the variables
x-14=0
We move all terms containing x to the left, all other terms to the right
x=14
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