4a-9=3a+12

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Solution for 4a-9=3a+12 equation: 



4a-9=3a+12

We move all terms to the left:

4a-9-(3a+12)=0

We get rid of parentheses

4a-3a-12-9=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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