3(6+3r)=81

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Solution for 3(6+3r)=81 equation: 


Simplifying
3(6 + 3r) = 81
(6 * 3 + 3r * 3) = 81
(18 + 9r) = 81

Solving
18 + 9r = 81

Solving for variable 'r'.

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

Add '-18' to each side of the equation.
18 + -18 + 9r = 81 + -18

Combine like terms: 18 + -18 = 0
0 + 9r = 81 + -18
9r = 81 + -18

Combine like terms: 81 + -18 = 63
9r = 63

Divide each side by '9'.
r = 7

Simplifying
r = 7

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