81=3r-7

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Solution for 81=3r-7 equation:


Simplifying
81 = 3r + -7

Reorder the terms:
81 = -7 + 3r

Solving
81 = -7 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
81 + -3r = -7 + 3r + -3r

Combine like terms: 3r + -3r = 0
81 + -3r = -7 + 0
81 + -3r = -7

Add '-81' to each side of the equation.
81 + -81 + -3r = -7 + -81

Combine like terms: 81 + -81 = 0
0 + -3r = -7 + -81
-3r = -7 + -81

Combine like terms: -7 + -81 = -88
-3r = -88

Divide each side by '-3'.
r = 29.33333333

Simplifying
r = 29.33333333

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