r+21=15

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Solution for r+21=15 equation: 


Simplifying
r + 21 = 15

Reorder the terms:
21 + r = 15

Solving
21 + r = 15

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + r = 15 + -21

Combine like terms: 21 + -21 = 0
0 + r = 15 + -21
r = 15 + -21

Combine like terms: 15 + -21 = -6
r = -6

Simplifying
r = -6

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