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m in (-oo:+oo)
(-3*m)/7 = -1 // + 1
(-3*m)/7+1 = 0
1-3/7*m = 0 // - 1
-3/7*m = -1 // : -3/7
m = -1/(-3/7)
m = 7/3
m = 7/3
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