A+a+a=18

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Solution for A+a+a=18 equation: 



+A+A=18

We move all terms to the left:

+A+A-(18)=0

We add all the numbers together, and all the variables

2A-18=0

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

2A=18

A=18/2

A=9

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