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(6x+9)+(6x+9)=5x-1
We move all terms to the left:
(6x+9)+(6x+9)-(5x-1)=0
We get rid of parentheses
6x+6x-5x+9+9+1=0
We add all the numbers together, and all the variables
7x+19=0
We move all terms containing x to the left, all other terms to the right
7x=-19
x=-19/7
x=-2+5/7
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