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(3x+39)=90
We move all terms to the left:
(3x+39)-(90)=0
We get rid of parentheses
3x+39-90=0
We add all the numbers together, and all the variables
3x-51=0
We move all terms containing x to the left, all other terms to the right
3x=51
x=51/3
x=17
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