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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x+x+9-90=0

We add all the numbers together, and all the variables

3x-81=0

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

3x=81

x=81/3

x=27

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