(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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