15-3a=21

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Solution for 15-3a=21 equation: 



15-3a=21

We move all terms to the left:

15-3a-(21)=0

We add all the numbers together, and all the variables

-3a-6=0

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

-3a=6

a=6/-3

a=-2

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