r(x)=18-0.5x

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Solution for r(x)=18-0.5x equation: 


Simplifying
r(x) = 18 + -0.5x

Multiply r * x
rx = 18 + -0.5x

Solving
rx = 18 + -0.5x

Solving for variable 'r'.

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

Divide each side by 'x'.
r = 18x-1 + -0.5

Simplifying
r = 18x-1 + -0.5

Reorder the terms:
r = -0.5 + 18x-1

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