r-3=12

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Solution for r-3=12 equation: 


Simplifying
r + -3 = 12

Reorder the terms:
-3 + r = 12

Solving
-3 + r = 12

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + r = 12 + 3

Combine like terms: -3 + 3 = 0
0 + r = 12 + 3
r = 12 + 3

Combine like terms: 12 + 3 = 15
r = 15

Simplifying
r = 15

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