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(2x+23)+(9x-5)=90
We move all terms to the left:
(2x+23)+(9x-5)-(90)=0
We get rid of parentheses
2x+9x+23-5-90=0
We add all the numbers together, and all the variables
11x-72=0
We move all terms containing x to the left, all other terms to the right
11x=72
x=72/11
x=6+6/11
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