r+8r-5r=-20

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Solution for r+8r-5r=-20 equation: 


Simplifying
r + 8r + -5r = -20

Combine like terms: r + 8r = 9r
9r + -5r = -20

Combine like terms: 9r + -5r = 4r
4r = -20

Solving
4r = -20

Solving for variable 'r'.

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

Divide each side by '4'.
r = -5

Simplifying
r = -5

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