3a+5a+12=28

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Solution for 3a+5a+12=28 equation: 



3a+5a+12=28

We move all terms to the left:

3a+5a+12-(28)=0

We add all the numbers together, and all the variables

8a-16=0

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

8a=16

a=16/8

a=2

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