10a-7+9a=13

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Solution for 10a-7+9a=13 equation: 



10a-7+9a=13

We move all terms to the left:

10a-7+9a-(13)=0

We add all the numbers together, and all the variables

19a-20=0

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

19a=20

a=20/19

a=1+1/19

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