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(12)(2x+1)=90
We move all terms to the left:
(12)(2x+1)-(90)=0
We multiply parentheses
24x+12-90=0
We add all the numbers together, and all the variables
24x-78=0
We move all terms containing x to the left, all other terms to the right
24x=78
x=78/24
x=3+1/4
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