3a-a-4=12

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Solution for 3a-a-4=12 equation: 



3a-a-4=12

We move all terms to the left:

3a-a-4-(12)=0

We add all the numbers together, and all the variables

2a-16=0

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

2a=16

a=16/2

a=8

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