X=2a-20

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Solution for X=2a-20 equation: 



X=2X-20

We move all terms to the left:

X-(2X-20)=0

We get rid of parentheses

X-2X+20=0

We add all the numbers together, and all the variables

-1X+20=0

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

-X=-20

X=-20/-1

X=+20

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