39=pir^2(5)

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Solution for 39=pir^2(5) equation:


Simplifying
39 = pir2(5)

Reorder the terms for easier multiplication:
39 = 5ipr2

Solving
39 = 5ipr2

Solving for variable 'i'.

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

Add '-5ipr2' to each side of the equation.
39 + -5ipr2 = 5ipr2 + -5ipr2

Combine like terms: 5ipr2 + -5ipr2 = 0
39 + -5ipr2 = 0

Add '-39' to each side of the equation.
39 + -39 + -5ipr2 = 0 + -39

Combine like terms: 39 + -39 = 0
0 + -5ipr2 = 0 + -39
-5ipr2 = 0 + -39

Combine like terms: 0 + -39 = -39
-5ipr2 = -39

Divide each side by '-5pr2'.
i = 7.8p-1r-2

Simplifying
i = 7.8p-1r-2

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