57-3x=6x+21

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Solution for 57-3x=6x+21 equation: 



57-3x=6x+21

We move all terms to the left:

57-3x-(6x+21)=0

We get rid of parentheses

-3x-6x-21+57=0

We add all the numbers together, and all the variables

-9x+36=0

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

-9x=-36

x=-36/-9

x=+4

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