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(6x+21)+(3x+19)=2x+96
We move all terms to the left:
(6x+21)+(3x+19)-(2x+96)=0
We get rid of parentheses
6x+3x-2x+21+19-96=0
We add all the numbers together, and all the variables
7x-56=0
We move all terms containing x to the left, all other terms to the right
7x=56
x=56/7
x=8
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