20-r=19

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Solution for 20-r=19 equation: 


Simplifying
20 + -1r = 19

Solving
20 + -1r = 19

Solving for variable 'r'.

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

Add '-20' to each side of the equation.
20 + -20 + -1r = 19 + -20

Combine like terms: 20 + -20 = 0
0 + -1r = 19 + -20
-1r = 19 + -20

Combine like terms: 19 + -20 = -1
-1r = -1

Divide each side by '-1'.
r = 1

Simplifying
r = 1

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