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(8x+1)+(3x+12)=90
We move all terms to the left:
(8x+1)+(3x+12)-(90)=0
We get rid of parentheses
8x+3x+1+12-90=0
We add all the numbers together, and all the variables
11x-77=0
We move all terms containing x to the left, all other terms to the right
11x=77
x=77/11
x=7
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