r-12=-9

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Solution for r-12=-9 equation: 


Simplifying
r + -12 = -9

Reorder the terms:
-12 + r = -9

Solving
-12 + r = -9

Solving for variable 'r'.

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

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

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

Combine like terms: -9 + 12 = 3
r = 3

Simplifying
r = 3

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