X+99=2x-40

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Solution for X+99=2x-40 equation: 



X+99=2X-40

We move all terms to the left:

X+99-(2X-40)=0

We get rid of parentheses

X-2X+40+99=0

We add all the numbers together, and all the variables

-1X+139=0

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

-X=-139

X=-139/-1

X=+139

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