72=-12r+9

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Solution for 72=-12r+9 equation:


Simplifying
72 = -12r + 9

Reorder the terms:
72 = 9 + -12r

Solving
72 = 9 + -12r

Solving for variable 'r'.

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

Add '12r' to each side of the equation.
72 + 12r = 9 + -12r + 12r

Combine like terms: -12r + 12r = 0
72 + 12r = 9 + 0
72 + 12r = 9

Add '-72' to each side of the equation.
72 + -72 + 12r = 9 + -72

Combine like terms: 72 + -72 = 0
0 + 12r = 9 + -72
12r = 9 + -72

Combine like terms: 9 + -72 = -63
12r = -63

Divide each side by '12'.
r = -5.25

Simplifying
r = -5.25

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