-21=5x-7

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Solution for -21=5x-7 equation: 



-21=5x-7

We move all terms to the left:

-21-(5x-7)=0

We get rid of parentheses

-5x+7-21=0

We add all the numbers together, and all the variables

-5x-14=0

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

-5x=14

x=14/-5

x=-2+4/5

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