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(2x+23)+(5x-4)=90
We move all terms to the left:
(2x+23)+(5x-4)-(90)=0
We get rid of parentheses
2x+5x+23-4-90=0
We add all the numbers together, and all the variables
7x-71=0
We move all terms containing x to the left, all other terms to the right
7x=71
x=71/7
x=10+1/7
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