-2x-x-21=30

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Solution for -2x-x-21=30 equation: 



-2x-x-21=30

We move all terms to the left:

-2x-x-21-(30)=0

We add all the numbers together, and all the variables

-3x-51=0

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

-3x=51

x=51/-3

x=-17

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