(x+12)+(2x+9)=90

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Solution for (x+12)+(2x+9)=90 equation: 



(x+12)+(2x+9)=90

We move all terms to the left:

(x+12)+(2x+9)-(90)=0

We get rid of parentheses

x+2x+12+9-90=0

We add all the numbers together, and all the variables

3x-69=0

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

3x=69

x=69/3

x=23

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