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m in (-oo:+oo)
75*m = 80-(m/5) // - 80-(m/5)
75*m+m/5-80 = 0
376/5*m-80 = 0 // + 80
376/5*m = 80 // : 376/5
m = 80/376/5
m = 50/47
m = 50/47
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