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m in (-oo:+oo)
(-1/5)*m+1 = 49/60 // - 49/60
(-1/5)*m-(49/60)+1 = 0
(-1/5)*m-49/60+1 = 0
11/60-1/5*m = 0 // - 11/60
-1/5*m = -11/60 // : -1/5
m = -11/60/(-1/5)
m = 11/12
m = 11/12
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