21+r=-0.5

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Solution for 21+r=-0.5 equation: 


Simplifying
21 + r = -0.5

Solving
21 + r = -0.5

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 = -0.5 + -21

Combine like terms: 21 + -21 = 0
0 + r = -0.5 + -21
r = -0.5 + -21

Combine like terms: -0.5 + -21 = -21.5
r = -21.5

Simplifying
r = -21.5

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