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(17+2x+23)=90
We move all terms to the left:
(17+2x+23)-(90)=0
We add all the numbers together, and all the variables
(2x+40)-90=0
We get rid of parentheses
2x+40-90=0
We add all the numbers together, and all the variables
2x-50=0
We move all terms containing x to the left, all other terms to the right
2x=50
x=50/2
x=25
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