r+(-12)=9

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Solution for r+(-12)=9 equation: 


Simplifying
r + (-12) = 9
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 = 21
r = 21

Simplifying
r = 21

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