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(6x+2)+(6x+4)=90
We move all terms to the left:
(6x+2)+(6x+4)-(90)=0
We get rid of parentheses
6x+6x+2+4-90=0
We add all the numbers together, and all the variables
12x-84=0
We move all terms containing x to the left, all other terms to the right
12x=84
x=84/12
x=7
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