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)=0

We add all the numbers together, and all the variables

-1X+9=0

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

-X=-9

X=-9/-1

X=+9

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