r(x)=100*.4x

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Solution for r(x)=100*.4x equation: 


Simplifying
r(x) = 100 * 0.4x

Multiply r * x
rx = 100 * 0.4x

Multiply 100 * 0.4
rx = 40x

Solving
rx = 40x

Solving for variable 'r'.

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

Divide each side by 'x'.
r = 40

Simplifying
r = 40

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