a+a+a+a=16

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Solution for a+a+a+a=16 equation: 



a+a+a+a=16

We move all terms to the left:

a+a+a+a-(16)=0

We add all the numbers together, and all the variables

4a-16=0

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

4a=16

a=16/4

a=4

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