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(6x+19)+(6x+19)=90
We move all terms to the left:
(6x+19)+(6x+19)-(90)=0
We get rid of parentheses
6x+6x+19+19-90=0
We add all the numbers together, and all the variables
12x-52=0
We move all terms containing x to the left, all other terms to the right
12x=52
x=52/12
x=4+1/3
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