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r in (-oo:+oo)
75 = (5000/12)*r // - (5000/12)*r
75-((5000/12)*r) = 0
(-1250/3)*r+75 = 0
75-1250/3*r = 0 // - 75
-1250/3*r = -75 // : -1250/3
r = -75/(-1250/3)
r = 9/50
r = 9/50
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