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

4a-8=0

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

4a=8

a=8/4

a=2

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