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(7x+3)+(2x+33)=90
We move all terms to the left:
(7x+3)+(2x+33)-(90)=0
We get rid of parentheses
7x+2x+3+33-90=0
We add all the numbers together, and all the variables
9x-54=0
We move all terms containing x to the left, all other terms to the right
9x=54
x=54/9
x=6
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