x-21=40;x

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Solution for x-21=40;x equation: 



x-21=40x

We move all terms to the left:

x-21-(40x)=0

We add all the numbers together, and all the variables

-39x-21=0

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

-39x=21

x=21/-39

x=-7/13

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