9=-r/8

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Solution for 9=-r/8 equation: 


r in (-oo:+oo)

9 = -r/8 // + -r/8

9-(-r/8) = 0

(1/8)*r+9 = 0

1/8*r+9 = 0 // - 9

1/8*r = -9 // : 1/8

r = -9/1/8

r = -72

r = -72

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