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90=(x+23)=(x+13)
We move all terms to the left:
90-((x+23))=0
We calculate terms in parentheses: -((x+23)), so:We get rid of parentheses
(x+23)
We get rid of parentheses
x+23
Back to the equation:
-(x+23)
-x-23+90=0
We add all the numbers together, and all the variables
-1x+67=0
We move all terms containing x to the left, all other terms to the right
-x=-67
x=-67/-1
x=+67
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