9a+4a=28

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Solution for 9a+4a=28 equation: 



9a+4a=28

We move all terms to the left:

9a+4a-(28)=0

We add all the numbers together, and all the variables

13a-28=0

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

13a=28

a=28/13

a=2+2/13

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