r^2-2r-r^2+8r=20

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Solution for r^2-2r-r^2+8r=20 equation: 


Simplifying
r2 + -2r + -1r2 + 8r = 20

Reorder the terms:
-2r + 8r + r2 + -1r2 = 20

Combine like terms: -2r + 8r = 6r
6r + r2 + -1r2 = 20

Combine like terms: r2 + -1r2 = 0
6r + 0 = 20
6r = 20

Solving
6r = 20

Solving for variable 'r'.

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

Divide each side by '6'.
r = 3.333333333

Simplifying
r = 3.333333333

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