r(20)=20(80-3*20)

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Solution for r(20)=20(80-3*20) equation: 


Simplifying
r(20) = 20(80 + -3 * 20)

Reorder the terms for easier multiplication:
20r = 20(80 + -3 * 20)

Multiply -3 * 20
20r = 20(80 + -60)

Combine like terms: 80 + -60 = 20
20r = 20(20)

Multiply 20 * 20
20r = 400

Solving
20r = 400

Solving for variable 'r'.

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

Divide each side by '20'.
r = 20

Simplifying
r = 20

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