ab=rb+r

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Solution for ab=rb+r equation: 


Simplifying
ab = rb + r

Solving
ab = br + r

Solving for variable 'a'.

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

Divide each side by 'b'.
a = r + b-1r

Simplifying
a = r + b-1r

Reorder the terms:
a = b-1r + r

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