7a+3a=21

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Solution for 7a+3a=21 equation: 



7a+3a=21

We move all terms to the left:

7a+3a-(21)=0

We add all the numbers together, and all the variables

10a-21=0

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

10a=21

a=21/10

a=2+1/10

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