31-r=21

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Solution for 31-r=21 equation: 


Simplifying
31 + -1r = 21

Solving
31 + -1r = 21

Solving for variable 'r'.

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

Add '-31' to each side of the equation.
31 + -31 + -1r = 21 + -31

Combine like terms: 31 + -31 = 0
0 + -1r = 21 + -31
-1r = 21 + -31

Combine like terms: 21 + -31 = -10
-1r = -10

Divide each side by '-1'.
r = 10

Simplifying
r = 10

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