21=-15a+1

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Solution for 21=-15a+1 equation: 



21=-15a+1

We move all terms to the left:

21-(-15a+1)=0

We get rid of parentheses

15a-1+21=0

We add all the numbers together, and all the variables

15a+20=0

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

15a=-20

a=-20/15

a=-1+1/3

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