A+30+a+12+a=180

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Solution for A+30+a+12+a=180 equation: 



+30+A+12+A=180

We move all terms to the left:

+30+A+12+A-(180)=0

We add all the numbers together, and all the variables

2A-138=0

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

2A=138

A=138/2

A=69

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