A+b+b=30

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Solution for A+b+b=30 equation: 



+A+A=30

We move all terms to the left:

+A+A-(30)=0

We add all the numbers together, and all the variables

2A-30=0

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

2A=30

A=30/2

A=15

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