39-r=21

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Solution for 39-r=21 equation: 


Simplifying
39 + -1r = 21

Solving
39 + -1r = 21

Solving for variable 'r'.

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

Add '-39' to each side of the equation.
39 + -39 + -1r = 21 + -39

Combine like terms: 39 + -39 = 0
0 + -1r = 21 + -39
-1r = 21 + -39

Combine like terms: 21 + -39 = -18
-1r = -18

Divide each side by '-1'.
r = 18

Simplifying
r = 18

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