3a-9=42

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Solution for 3a-9=42 equation: 



3a-9=42

We move all terms to the left:

3a-9-(42)=0

We add all the numbers together, and all the variables

3a-51=0

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

3a=51

a=51/3

a=17

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