9-4a+12=4a+21

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Solution for 9-4a+12=4a+21 equation: 



9-4a+12=4a+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-4a-4a-21+21=0

We add all the numbers together, and all the variables

-8a=0

a=0/-8

a=0

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