90=(13x)+(10x+21)

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Solution for 90=(13x)+(10x+21) equation: 



90=(13x)+(10x+21)

We move all terms to the left:

90-((13x)+(10x+21))=0



We calculate terms in parentheses: -(13x+(10x+21)), so:

13x+(10x+21)

We get rid of parentheses

13x+10x+21

We add all the numbers together, and all the variables

23x+21

Back to the equation:

-(23x+21)



We get rid of parentheses

-23x-21+90=0

We add all the numbers together, and all the variables

-23x+69=0

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

-23x=-69

x=-69/-23

x=+3

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