4.5a+12=21

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Solution for 4.5a+12=21 equation: 



4.5a+12=21

We move all terms to the left:

4.5a+12-(21)=0

We add all the numbers together, and all the variables

4.5a-9=0

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

4.5a=9

a=9/4.5

a=2

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