15/4=-r/8

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Solution for 15/4=-r/8 equation: 


r in (-oo:+oo)

15/4 = -r/8 // + -r/8

15/4-(-r/8) = 0

(1/8)*r+15/4 = 0

1/8*r+15/4 = 0 // - 15/4

1/8*r = -15/4 // : 1/8

r = -15/4/1/8

r = -30

r = -30

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