13-a9,a=10

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Solution for 13-a9,a=10 equation: 



13-a9.a=10

We move all terms to the left:

13-a9.a-(10)=0

We add all the numbers together, and all the variables

-a9.a+3=0

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

-a9.a=-3

a=-3/1

a=-3

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