-51=21x-4x

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Solution for -51=21x-4x equation: 



-51=21x-4x

We move all terms to the left:

-51-(21x-4x)=0

We add all the numbers together, and all the variables

-(+17x)-51=0

We get rid of parentheses

-17x-51=0

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

-17x=51

x=51/-17

x=-3

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