-4x-21=-77

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Solution for -4x-21=-77 equation: 



-4x-21=-77

We move all terms to the left:

-4x-21-(-77)=0

We add all the numbers together, and all the variables

-4x+56=0

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

-4x=-56

x=-56/-4

x=+14

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