15+4a-6=21

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Solution for 15+4a-6=21 equation: 



15+4a-6=21

We move all terms to the left:

15+4a-6-(21)=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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