6x+57=21-3x

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



6x+57=21-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x+3x-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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