A-3+3a=13+a

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Solution for A-3+3a=13+a equation: 



-3+3A=13+A

We move all terms to the left:

-3+3A-(13+A)=0

We add all the numbers together, and all the variables

3A-(A+13)-3=0

We get rid of parentheses

3A-A-13-3=0

We add all the numbers together, and all the variables

2A-16=0

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

2A=16

A=16/2

A=8

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