75/120=r/20

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Solution for 75/120=r/20 equation: 


r in (-oo:+oo)

75/120 = r/20 // - r/20

75/120-(r/20) = 0

5/8-1/20*r = 0 // - 5/8

-1/20*r = -5/8 // : -1/20

r = -5/8/(-1/20)

r = 25/2

r = 25/2

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