21=3r

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Solution for 21=3r equation:


Simplifying
21 = 3r

Solving
21 = 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
21 + -3r = 3r + -3r

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

Add '-21' to each side of the equation.
21 + -21 + -3r = 0 + -21

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

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

Divide each side by '-3'.
r = 7

Simplifying
r = 7

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