r=x*(0.6-x)*(1.2-x)

Solution for r=x*(0.6-x)*(1.2-x) equation:

Simplifying
r = x(0.6 + -1x)(1.2 + -1x)

Multiply (0.6 + -1x) * (1.2 + -1x)
r = x(0.6(1.2 + -1x) + -1x * (1.2 + -1x))
r = x((1.2 * 0.6 + -1x * 0.6) + -1x * (1.2 + -1x))
r = x((0.72 + -0.6x) + -1x * (1.2 + -1x))
r = x(0.72 + -0.6x + (1.2 * -1x + -1x * -1x))
r = x(0.72 + -0.6x + (-1.2x + 1x2))

Combine like terms: -0.6x + -1.2x = -1.8x
r = x(0.72 + -1.8x + 1x2)
r = (0.72 * x + -1.8x * x + 1x2 * x)
r = (0.72x + -1.8x2 + 1x3)

Solving
r = 0.72x + -1.8x2 + 1x3

Solving for variable 'r'.

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

Simplifying
r = 0.72x + -1.8x2 + 1x3