Lr-2=-1

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Solution for Lr-2=-1 equation: 


Simplifying
Lr + -2 = -1

Reorder the terms:
-2 + rL = -1

Solving
-2 + rL = -1

Solving for variable 'r'.

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

Add '2' to each side of the equation.
-2 + 2 + rL = -1 + 2

Combine like terms: -2 + 2 = 0
0 + rL = -1 + 2
rL = -1 + 2

Combine like terms: -1 + 2 = 1
rL = 1

Divide each side by 'L'.
r = L-1

Simplifying
r = L-1

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