9a+4a-21=8+2a+4

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Solution for 9a+4a-21=8+2a+4 equation: 



9a+4a-21=8+2a+4

We move all terms to the left:

9a+4a-21-(8+2a+4)=0

We add all the numbers together, and all the variables

9a+4a-(2a+12)-21=0

We add all the numbers together, and all the variables

13a-(2a+12)-21=0

We get rid of parentheses

13a-2a-12-21=0

We add all the numbers together, and all the variables

11a-33=0

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

11a=33

a=33/11

a=3

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