21-5a=6

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Solution for 21-5a=6 equation: 



21-5a=6

We move all terms to the left:

21-5a-(6)=0

We add all the numbers together, and all the variables

-5a+15=0

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

-5a=-15

a=-15/-5

a=+3

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