-400=-20r

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Solution for -400=-20r equation:


Simplifying
-400 = -20r

Solving
-400 = -20r

Solving for variable 'r'.

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

Add '20r' to each side of the equation.
-400 + 20r = -20r + 20r

Combine like terms: -20r + 20r = 0
-400 + 20r = 0

Add '400' to each side of the equation.
-400 + 400 + 20r = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 20r = 0 + 400
20r = 0 + 400

Combine like terms: 0 + 400 = 400
20r = 400

Divide each side by '20'.
r = 20

Simplifying
r = 20

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