3a-6a=-21

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Solution for 3a-6a=-21 equation: 



3a-6a=-21

We move all terms to the left:

3a-6a-(-21)=0

We add all the numbers together, and all the variables

-3a+21=0

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

-3a=-21

a=-21/-3

a=+7

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