3a-9=51

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Solution for 3a-9=51 equation: 



3a-9=51

We move all terms to the left:

3a-9-(51)=0

We add all the numbers together, and all the variables

3a-60=0

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

3a=60

a=60/3

a=20

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