3(6+3r)=90

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Solution for 3(6+3r)=90 equation: 


Simplifying
3(6 + 3r) = 90
(6 * 3 + 3r * 3) = 90
(18 + 9r) = 90

Solving
18 + 9r = 90

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 = 90 + -18

Combine like terms: 18 + -18 = 0
0 + 9r = 90 + -18
9r = 90 + -18

Combine like terms: 90 + -18 = 72
9r = 72

Divide each side by '9'.
r = 8

Simplifying
r = 8

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