r(x)=x(13-0.04x)

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Solution for r(x)=x(13-0.04x) equation: 


Simplifying
r(x) = x(13 + -0.04x)

Multiply r * x
rx = x(13 + -0.04x)
rx = (13 * x + -0.04x * x)
rx = (13x + -0.04x2)

Solving
rx = 13x + -0.04x2

Solving for variable 'r'.

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

Divide each side by 'x'.
r = 13 + -0.04x

Simplifying
r = 13 + -0.04x

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