57=20+(30-5-x)

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Solution for 57=20+(30-5-x) equation: 



57=20+(30-5-x)

We move all terms to the left:

57-(20+(30-5-x))=0

We add all the numbers together, and all the variables

-(20+(-1x+25))+57=0



We calculate terms in parentheses: -(20+(-1x+25)), so:

20+(-1x+25)

determiningTheFunctionDomain
(-1x+25)+20

We get rid of parentheses

-1x+25+20

We add all the numbers together, and all the variables

-1x+45

Back to the equation:

-(-1x+45)



We get rid of parentheses

1x-45+57=0

We add all the numbers together, and all the variables

x+12=0

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

x=-12

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