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m in (-oo:+oo)
(-7/8)*m = 1-4 // - 1-4
(-7/8)*m-1+4 = 0
3-7/8*m = 0 // - 3
-7/8*m = -3 // : -7/8
m = -3/(-7/8)
m = 24/7
m = 24/7
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