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(12x-1)+(9x-15)=53
We move all terms to the left:
(12x-1)+(9x-15)-(53)=0
We get rid of parentheses
12x+9x-1-15-53=0
We add all the numbers together, and all the variables
21x-69=0
We move all terms containing x to the left, all other terms to the right
21x=69
x=69/21
x=3+2/7
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