r-80=20

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Solution for r-80=20 equation: 


Simplifying
r + -80 = 20

Reorder the terms:
-80 + r = 20

Solving
-80 + r = 20

Solving for variable 'r'.

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

Add '80' to each side of the equation.
-80 + 80 + r = 20 + 80

Combine like terms: -80 + 80 = 0
0 + r = 20 + 80
r = 20 + 80

Combine like terms: 20 + 80 = 100
r = 100

Simplifying
r = 100

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