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 = 9
r = 9

Simplifying
r = 9

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