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(4x+23)+(5x-7)=90
We move all terms to the left:
(4x+23)+(5x-7)-(90)=0
We get rid of parentheses
4x+5x+23-7-90=0
We add all the numbers together, and all the variables
9x-74=0
We move all terms containing x to the left, all other terms to the right
9x=74
x=74/9
x=8+2/9
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