-21=9-5x

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Solution for -21=9-5x equation: 



-21=9-5x

We move all terms to the left:

-21-(9-5x)=0

We add all the numbers together, and all the variables

-(-5x+9)-21=0

We get rid of parentheses

5x-9-21=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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