r-21=58

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Solution for r-21=58 equation: 


Simplifying
r + -21 = 58

Reorder the terms:
-21 + r = 58

Solving
-21 + r = 58

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 = 58 + 21

Combine like terms: -21 + 21 = 0
0 + r = 58 + 21
r = 58 + 21

Combine like terms: 58 + 21 = 79
r = 79

Simplifying
r = 79

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