r(20)=20(90-3(20))

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Solution for r(20)=20(90-3(20)) equation: 


Simplifying
r(20) = 20(90 + -3(20))

Reorder the terms for easier multiplication:
20r = 20(90 + -3(20))

Multiply -3 * 20
20r = 20(90 + -60)

Combine like terms: 90 + -60 = 30
20r = 20(30)

Multiply 20 * 30
20r = 600

Solving
20r = 600

Solving for variable 'r'.

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

Divide each side by '20'.
r = 30

Simplifying
r = 30

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