X+2x+9=90

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Solution for X+2x+9=90 equation: 



X+2X+9=90

We move all terms to the left:

X+2X+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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