-57=19a-12-4a

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Solution for -57=19a-12-4a equation: 



-57=19a-12-4a

We move all terms to the left:

-57-(19a-12-4a)=0

We add all the numbers together, and all the variables

-(15a-12)-57=0

We get rid of parentheses

-15a+12-57=0

We add all the numbers together, and all the variables

-15a-45=0

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

-15a=45

a=45/-15

a=-3

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