3a-12+2a+6-21=

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Solution for 3a-12+2a+6-21= equation: 



3a-12+2a+6-21=

We move all terms to the left:

3a-12+2a+6-21-()=0

We add all the numbers together, and all the variables

5a=0

a=0/5

a=0

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