Fr=U+B

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Solution for Fr=U+B equation: 


Simplifying
Fr = U + B

Reorder the terms:
rF = B + U

Solving
rF = B + U

Solving for variable 'r'.

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

Divide each side by 'F'.
r = BF-1 + F-1U

Simplifying
r = BF-1 + F-1U

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