3r-4=81

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Solution for 3r-4=81 equation: 


Simplifying
3r + -4 = 81

Reorder the terms:
-4 + 3r = 81

Solving
-4 + 3r = 81

Solving for variable 'r'.

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

Add '4' to each side of the equation.
-4 + 4 + 3r = 81 + 4

Combine like terms: -4 + 4 = 0
0 + 3r = 81 + 4
3r = 81 + 4

Combine like terms: 81 + 4 = 85
3r = 85

Divide each side by '3'.
r = 28.33333333

Simplifying
r = 28.33333333

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