4a-6+5a=21

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Solution for 4a-6+5a=21 equation: 



4a-6+5a=21

We move all terms to the left:

4a-6+5a-(21)=0

We add all the numbers together, and all the variables

9a-27=0

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

9a=27

a=27/9

a=3

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