400=r*12

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Solution for 400=r*12 equation:


Simplifying
400 = r * 12

Reorder the terms for easier multiplication:
400 = 12r

Solving
400 = 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
400 + -12r = 12r + -12r

Combine like terms: 12r + -12r = 0
400 + -12r = 0

Add '-400' to each side of the equation.
400 + -400 + -12r = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -12r = 0 + -400
-12r = 0 + -400

Combine like terms: 0 + -400 = -400
-12r = -400

Divide each side by '-12'.
r = 33.33333333

Simplifying
r = 33.33333333

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