(x+21)+(2x+9)=909

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Solution for (x+21)+(2x+9)=909 equation: 



(x+21)+(2x+9)=909

We move all terms to the left:

(x+21)+(2x+9)-(909)=0

We get rid of parentheses

x+2x+21+9-909=0

We add all the numbers together, and all the variables

3x-879=0

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

3x=879

x=879/3

x=293

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