r(x)=x(125-4x)

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Solution for r(x)=x(125-4x) equation: 


Simplifying
r(x) = x(125 + -4x)

Multiply r * x
rx = x(125 + -4x)
rx = (125 * x + -4x * x)
rx = (125x + -4x2)

Solving
rx = 125x + -4x2

Solving for variable 'r'.

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

Divide each side by 'x'.
r = 125 + -4x

Simplifying
r = 125 + -4x

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