21-2a=8

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Solution for 21-2a=8 equation: 



21-2a=8

We move all terms to the left:

21-2a-(8)=0

We add all the numbers together, and all the variables

-2a+13=0

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

-2a=-13

a=-13/-2

a=6+1/2

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