9x^3+18x^2-72r=0

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Solution for 9x^3+18x^2-72r=0 equation: 


Simplifying
9x3 + 18x2 + -72r = 0

Reorder the terms:
-72r + 18x2 + 9x3 = 0

Solving
-72r + 18x2 + 9x3 = 0

Solving for variable 'r'.

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

Add '-18x2' to each side of the equation.
-72r + 18x2 + -18x2 + 9x3 = 0 + -18x2

Combine like terms: 18x2 + -18x2 = 0
-72r + 0 + 9x3 = 0 + -18x2
-72r + 9x3 = 0 + -18x2
Remove the zero:
-72r + 9x3 = -18x2

Add '-9x3' to each side of the equation.
-72r + 9x3 + -9x3 = -18x2 + -9x3

Combine like terms: 9x3 + -9x3 = 0
-72r + 0 = -18x2 + -9x3
-72r = -18x2 + -9x3

Divide each side by '-72'.
r = 0.25x2 + 0.125x3

Simplifying
r = 0.25x2 + 0.125x3

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