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

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



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

We move all terms to the left:

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



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

(10x+21)

We get rid of parentheses

10x+21

Back to the equation:

-(10x+21)



We get rid of parentheses

13x-10x-21=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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