a+2+4a=12

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Solution for a+2+4a=12 equation: 



a+2+4a=12

We move all terms to the left:

a+2+4a-(12)=0

We add all the numbers together, and all the variables

5a-10=0

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

5a=10

a=10/5

a=2

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