-21=-5x=7x-1-2x

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Solution for -21=-5x=7x-1-2x equation: 



-21=-5x=7x-1-2x

We move all terms to the left:

-21-(-5x)=0

We get rid of parentheses

5x-21=0

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

5x=21

x=21/5

x=4+1/5

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