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

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



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

We move all terms to the left:

(x+21)+(2x+21)-(90)=0

We get rid of parentheses

x+2x+21+21-90=0

We add all the numbers together, and all the variables

3x-48=0

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

3x=48

x=48/3

x=16

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