9a-13=42

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Solution for 9a-13=42 equation: 



9a-13=42

We move all terms to the left:

9a-13-(42)=0

We add all the numbers together, and all the variables

9a-55=0

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

9a=55

a=55/9

a=6+1/9

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