6a-21=-9+4a

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Solution for 6a-21=-9+4a equation: 



6a-21=-9+4a

We move all terms to the left:

6a-21-(-9+4a)=0

We add all the numbers together, and all the variables

6a-(4a-9)-21=0

We get rid of parentheses

6a-4a+9-21=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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