21-9r=66

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Solution for 21-9r=66 equation: 


Simplifying
21 + -9r = 66

Solving
21 + -9r = 66

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + -9r = 66 + -21

Combine like terms: 21 + -21 = 0
0 + -9r = 66 + -21
-9r = 66 + -21

Combine like terms: 66 + -21 = 45
-9r = 45

Divide each side by '-9'.
r = -5

Simplifying
r = -5

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