57=21-x+9-x

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



57=21-x+9-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-2x+30)+57=0

We get rid of parentheses

2x-30+57=0

We add all the numbers together, and all the variables

2x+27=0

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

2x=-27

x=-27/2

x=-13+1/2

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