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(6x+42)=90
We move all terms to the left:
(6x+42)-(90)=0
We get rid of parentheses
6x+42-90=0
We add all the numbers together, and all the variables
6x-48=0
We move all terms containing x to the left, all other terms to the right
6x=48
x=48/6
x=8
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