-4+9.5(1-3.5r)=20.5

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Solution for -4+9.5(1-3.5r)=20.5 equation: 


Simplifying
-4 + 9.5(1 + -3.5r) = 20.5
-4 + (1 * 9.5 + -3.5r * 9.5) = 20.5
-4 + (9.5 + -33.25r) = 20.5

Combine like terms: -4 + 9.5 = 5.5
5.5 + -33.25r = 20.5

Solving
5.5 + -33.25r = 20.5

Solving for variable 'r'.

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

Add '-5.5' to each side of the equation.
5.5 + -5.5 + -33.25r = 20.5 + -5.5

Combine like terms: 5.5 + -5.5 = 0.0
0.0 + -33.25r = 20.5 + -5.5
-33.25r = 20.5 + -5.5

Combine like terms: 20.5 + -5.5 = 15
-33.25r = 15

Divide each side by '-33.25'.
r = -0.4511278195

Simplifying
r = -0.4511278195

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