19a-12a-4a=-57

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



19a-12a-4a=-57

We move all terms to the left:

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

We add all the numbers together, and all the variables

3a+57=0

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

3a=-57

a=-57/3

a=-19

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