9a-4a=30

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Solution for 9a-4a=30 equation: 



9a-4a=30

We move all terms to the left:

9a-4a-(30)=0

We add all the numbers together, and all the variables

5a-30=0

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

5a=30

a=30/5

a=6

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