r(4)=4(80-4*4)

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Solution for r(4)=4(80-4*4) equation: 


Simplifying
r(4) = 4(80 + -4 * 4)

Reorder the terms for easier multiplication:
4r = 4(80 + -4 * 4)

Multiply -4 * 4
4r = 4(80 + -16)

Combine like terms: 80 + -16 = 64
4r = 4(64)

Multiply 4 * 64
4r = 256

Solving
4r = 256

Solving for variable 'r'.

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

Divide each side by '4'.
r = 64

Simplifying
r = 64

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