(x+21)=(2x+9)=90

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Solution for (x+21)=(2x+9)=90 equation: 



(x+21)=(2x+9)=90

We move all terms to the left:

(x+21)-((2x+9))=0

We get rid of parentheses

x-((2x+9))+21=0



We calculate terms in parentheses: -((2x+9)), so:

(2x+9)

We get rid of parentheses

2x+9

Back to the equation:

-(2x+9)



We get rid of parentheses

x-2x-9+21=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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