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m in (-oo:+oo)
3/4 = 50*m // - 50*m
3/4-(50*m) = 0
3/4-50*m = 0
3/4-50*m = 0 // - 3/4
-50*m = -3/4 // : -50
m = -3/4/(-50)
m = 3/200
m = 3/200
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