9a-7a=42

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Solution for 9a-7a=42 equation: 



9a-7a=42

We move all terms to the left:

9a-7a-(42)=0

We add all the numbers together, and all the variables

2a-42=0

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

2a=42

a=42/2

a=21

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