x+21=2x-40

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Solution for x+21=2x-40 equation: 



x+21=2x-40

We move all terms to the left:

x+21-(2x-40)=0

We get rid of parentheses

x-2x+40+21=0

We add all the numbers together, and all the variables

-1x+61=0

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

-x=-61

x=-61/-1

x=+61

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