19=21-r

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Solution for 19=21-r equation:


Simplifying
19 = 21 + -1r

Solving
19 = 21 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
19 + r = 21 + -1r + r

Combine like terms: -1r + r = 0
19 + r = 21 + 0
19 + r = 21

Add '-19' to each side of the equation.
19 + -19 + r = 21 + -19

Combine like terms: 19 + -19 = 0
0 + r = 21 + -19
r = 21 + -19

Combine like terms: 21 + -19 = 2
r = 2

Simplifying
r = 2

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