-21=51+9x

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Solution for -21=51+9x equation: 



-21=51+9x

We move all terms to the left:

-21-(51+9x)=0

We add all the numbers together, and all the variables

-(9x+51)-21=0

We get rid of parentheses

-9x-51-21=0

We add all the numbers together, and all the variables

-9x-72=0

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

-9x=72

x=72/-9

x=-8

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