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(6x+23)+(12x-9)=90
We move all terms to the left:
(6x+23)+(12x-9)-(90)=0
We get rid of parentheses
6x+12x+23-9-90=0
We add all the numbers together, and all the variables
18x-76=0
We move all terms containing x to the left, all other terms to the right
18x=76
x=76/18
x=4+2/9
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