-7x=21,

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Solution for -7x=21, equation: 



-7x=21.

We move all terms to the left:

-7x-(21.)=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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