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(X+3)+(6X+10)=77
We move all terms to the left:
(X+3)+(6X+10)-(77)=0
We get rid of parentheses
X+6X+3+10-77=0
We add all the numbers together, and all the variables
7X-64=0
We move all terms containing X to the left, all other terms to the right
7X=64
X=64/7
X=9+1/7
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