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m in (-oo:+oo)
(-7/8)*m = 1/4 // - 1/4
(-7/8)*m-(1/4) = 0
(-7/8)*m-1/4 = 0
-7/8*m-1/4 = 0 // + 1/4
-7/8*m = 1/4 // : -7/8
m = 1/4/(-7/8)
m = -2/7
m = -2/7
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