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(8x+27)+(6x-21)=90
We move all terms to the left:
(8x+27)+(6x-21)-(90)=0
We get rid of parentheses
8x+6x+27-21-90=0
We add all the numbers together, and all the variables
14x-84=0
We move all terms containing x to the left, all other terms to the right
14x=84
x=84/14
x=6
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