3(1-4r)=81

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Solution for 3(1-4r)=81 equation: 


Simplifying
3(1 + -4r) = 81
(1 * 3 + -4r * 3) = 81
(3 + -12r) = 81

Solving
3 + -12r = 81

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + -12r = 81 + -3

Combine like terms: 3 + -3 = 0
0 + -12r = 81 + -3
-12r = 81 + -3

Combine like terms: 81 + -3 = 78
-12r = 78

Divide each side by '-12'.
r = -6.5

Simplifying
r = -6.5

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