81=r*27

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Solution for 81=r*27 equation:


Simplifying
81 = r * 27

Reorder the terms for easier multiplication:
81 = 27r

Solving
81 = 27r

Solving for variable 'r'.

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

Add '-27r' to each side of the equation.
81 + -27r = 27r + -27r

Combine like terms: 27r + -27r = 0
81 + -27r = 0

Add '-81' to each side of the equation.
81 + -81 + -27r = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -27r = 0 + -81
-27r = 0 + -81

Combine like terms: 0 + -81 = -81
-27r = -81

Divide each side by '-27'.
r = 3

Simplifying
r = 3

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