81+r=100

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Solution for 81+r=100 equation: 


Simplifying
81 + r = 100

Solving
81 + r = 100

Solving for variable 'r'.

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

Add '-81' to each side of the equation.
81 + -81 + r = 100 + -81

Combine like terms: 81 + -81 = 0
0 + r = 100 + -81
r = 100 + -81

Combine like terms: 100 + -81 = 19
r = 19

Simplifying
r = 19

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