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10-9x=90-23x
We move all terms to the left:
10-9x-(90-23x)=0
We add all the numbers together, and all the variables
-9x-(-23x+90)+10=0
We get rid of parentheses
-9x+23x-90+10=0
We add all the numbers together, and all the variables
14x-80=0
We move all terms containing x to the left, all other terms to the right
14x=80
x=80/14
x=5+5/7
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