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

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



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

We move all terms to the left:

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

We get rid of parentheses

x+2x+21+9-9=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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