21-3x=57

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Solution for 21-3x=57 equation: 



21-3x=57

We move all terms to the left:

21-3x-(57)=0

We add all the numbers together, and all the variables

-3x-36=0

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

-3x=36

x=36/-3

x=-12

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