57=21-x+9x

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Solution for 57=21-x+9x equation: 



57=21-x+9x

We move all terms to the left:

57-(21-x+9x)=0

We add all the numbers together, and all the variables

-(8x+21)+57=0

We get rid of parentheses

-8x-21+57=0

We add all the numbers together, and all the variables

-8x+36=0

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

-8x=-36

x=-36/-8

x=4+1/2

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