90=(x+13)+x

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Solution for 90=(x+13)+x equation:



90=(x+13)+x
We move all terms to the left:
90-((x+13)+x)=0
We calculate terms in parentheses: -((x+13)+x), so:
(x+13)+x
We add all the numbers together, and all the variables
x+(x+13)
We get rid of parentheses
x+x+13
We add all the numbers together, and all the variables
2x+13
Back to the equation:
-(2x+13)
We get rid of parentheses
-2x-13+90=0
We add all the numbers together, and all the variables
-2x+77=0
We move all terms containing x to the left, all other terms to the right
-2x=-77
x=-77/-2
x=38+1/2

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