Sa=2*3.14*r*b+2B

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Solution for Sa=2*3.14*r*b+2B equation: 


Simplifying
Sa = 2 * 3.14r * b + 2B

Multiply 2 * 3.14
aS = 6.28r * b + 2B

Multiply r * b
aS = 6.28br + 2B

Reorder the terms:
aS = 2B + 6.28br

Solving
aS = 2B + 6.28br

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by 'S'.
a = 2BS-1 + 6.28brS-1

Simplifying
a = 2BS-1 + 6.28brS-1

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