6-3*a=21

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Solution for 6-3*a=21 equation: 



6-3a=21

We move all terms to the left:

6-3a-(21)=0

We add all the numbers together, and all the variables

-3a-15=0

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

-3a=15

a=15/-3

a=-5

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