3(3r+12)=72

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Solution for 3(3r+12)=72 equation: 


Simplifying
3(3r + 12) = 72

Reorder the terms:
3(12 + 3r) = 72
(12 * 3 + 3r * 3) = 72
(36 + 9r) = 72

Solving
36 + 9r = 72

Solving for variable 'r'.

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

Add '-36' to each side of the equation.
36 + -36 + 9r = 72 + -36

Combine like terms: 36 + -36 = 0
0 + 9r = 72 + -36
9r = 72 + -36

Combine like terms: 72 + -36 = 36
9r = 36

Divide each side by '9'.
r = 4

Simplifying
r = 4

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