-3.5(1+6r)=20.5

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Solution for -3.5(1+6r)=20.5 equation: 


Simplifying
-3.5(1 + 6r) = 20.5
(1 * -3.5 + 6r * -3.5) = 20.5
(-3.5 + -21r) = 20.5

Solving
-3.5 + -21r = 20.5

Solving for variable 'r'.

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

Add '3.5' to each side of the equation.
-3.5 + 3.5 + -21r = 20.5 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -21r = 20.5 + 3.5
-21r = 20.5 + 3.5

Combine like terms: 20.5 + 3.5 = 24
-21r = 24

Divide each side by '-21'.
r = -1.142857143

Simplifying
r = -1.142857143

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