90=(13-5r)+4r

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Solution for 90=(13-5r)+4r equation: 



90=(13-5r)+4r

We move all terms to the left:

90-((13-5r)+4r)=0

We add all the numbers together, and all the variables

-((-5r+13)+4r)+90=0



We calculate terms in parentheses: -((-5r+13)+4r), so:

(-5r+13)+4r

We add all the numbers together, and all the variables

4r+(-5r+13)

We get rid of parentheses

4r-5r+13

We add all the numbers together, and all the variables

-1r+13

Back to the equation:

-(-1r+13)



We get rid of parentheses

1r-13+90=0

We add all the numbers together, and all the variables

r+77=0

We move all terms containing r to the left, all other terms to the right

r=-77

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