21-6a=27-8a

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Solution for 21-6a=27-8a equation: 



21-6a=27-8a

We move all terms to the left:

21-6a-(27-8a)=0

We add all the numbers together, and all the variables

-6a-(-8a+27)+21=0

We get rid of parentheses

-6a+8a-27+21=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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