-3a-21=42

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Solution for -3a-21=42 equation: 



-3a-21=42

We move all terms to the left:

-3a-21-(42)=0

We add all the numbers together, and all the variables

-3a-63=0

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

-3a=63

a=63/-3

a=-21

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