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(2x+17)+(3x-4)=90
We move all terms to the left:
(2x+17)+(3x-4)-(90)=0
We get rid of parentheses
2x+3x+17-4-90=0
We add all the numbers together, and all the variables
5x-77=0
We move all terms containing x to the left, all other terms to the right
5x=77
x=77/5
x=15+2/5
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