8a+7a=21

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Solution for 8a+7a=21 equation: 



8a+7a=21

We move all terms to the left:

8a+7a-(21)=0

We add all the numbers together, and all the variables

15a-21=0

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

15a=21

a=21/15

a=1+2/5

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