12-3r=21

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Solution for 12-3r=21 equation: 


Simplifying
12 + -3r = 21

Solving
12 + -3r = 21

Solving for variable 'r'.

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

Add '-12' to each side of the equation.
12 + -12 + -3r = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -3r = 21 + -12
-3r = 21 + -12

Combine like terms: 21 + -12 = 9
-3r = 9

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

Simplifying
r = -3

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