r(4)=4(90-3(4))

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Solution for r(4)=4(90-3(4)) equation: 


Simplifying
r(4) = 4(90 + -3(4))

Reorder the terms for easier multiplication:
4r = 4(90 + -3(4))

Multiply -3 * 4
4r = 4(90 + -12)

Combine like terms: 90 + -12 = 78
4r = 4(78)

Multiply 4 * 78
4r = 312

Solving
4r = 312

Solving for variable 'r'.

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

Divide each side by '4'.
r = 78

Simplifying
r = 78

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