-9x-21=78

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Solution for -9x-21=78 equation: 



-9x-21=78

We move all terms to the left:

-9x-21-(78)=0

We add all the numbers together, and all the variables

-9x-99=0

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

-9x=99

x=99/-9

x=-11

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