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(12x-19)+(6x+1)=90
We move all terms to the left:
(12x-19)+(6x+1)-(90)=0
We get rid of parentheses
12x+6x-19+1-90=0
We add all the numbers together, and all the variables
18x-108=0
We move all terms containing x to the left, all other terms to the right
18x=108
x=108/18
x=6
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