r(x)=x-3

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Solution for r(x)=x-3 equation: 


Simplifying
r(x) = x + -3

Multiply r * x
rx = x + -3

Reorder the terms:
rx = -3 + x

Solving
rx = -3 + x

Solving for variable 'r'.

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

Divide each side by 'x'.
r = -3x-1 + 1

Simplifying
r = -3x-1 + 1

Reorder the terms:
r = 1 + -3x-1

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