-x+57=3x+21

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



-x+57=3x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(3x+21)+57=0

We get rid of parentheses

-1x-3x-21+57=0

We add all the numbers together, and all the variables

-4x+36=0

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

-4x=-36

x=-36/-4

x=+9

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