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

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

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

r = -15/4/(-1/8)

r = 30

r = 30

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