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(8x-23)+(9-2x)=90
We move all terms to the left:
(8x-23)+(9-2x)-(90)=0
We add all the numbers together, and all the variables
(8x-23)+(-2x+9)-90=0
We get rid of parentheses
8x-2x-23+9-90=0
We add all the numbers together, and all the variables
6x-104=0
We move all terms containing x to the left, all other terms to the right
6x=104
x=104/6
x=17+1/3
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