81=36+12r

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Solution for 81=36+12r equation:


Simplifying
81 = 36 + 12r

Solving
81 = 36 + 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
81 + -12r = 36 + 12r + -12r

Combine like terms: 12r + -12r = 0
81 + -12r = 36 + 0
81 + -12r = 36

Add '-81' to each side of the equation.
81 + -81 + -12r = 36 + -81

Combine like terms: 81 + -81 = 0
0 + -12r = 36 + -81
-12r = 36 + -81

Combine like terms: 36 + -81 = -45
-12r = -45

Divide each side by '-12'.
r = 3.75

Simplifying
r = 3.75

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