X+21=2x-20

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Solution for X+21=2x-20 equation: 



X+21=2X-20

We move all terms to the left:

X+21-(2X-20)=0

We get rid of parentheses

X-2X+20+21=0

We add all the numbers together, and all the variables

-1X+41=0

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

-X=-41

X=-41/-1

X=+41

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