21-3r=8

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Solution for 21-3r=8 equation: 


Simplifying
21 + -3r = 8

Solving
21 + -3r = 8

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 + -3r = 8 + -21

Combine like terms: 21 + -21 = 0
0 + -3r = 8 + -21
-3r = 8 + -21

Combine like terms: 8 + -21 = -13
-3r = -13

Divide each side by '-3'.
r = 4.333333333

Simplifying
r = 4.333333333

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