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m in (-oo:+oo)
8/7 = (2/4)*m // - (2/4)*m
8/7-((2/4)*m) = 0
(-1/2)*m+8/7 = 0
8/7-1/2*m = 0 // - 8/7
-1/2*m = -8/7 // : -1/2
m = -8/7/(-1/2)
m = 16/7
m = 16/7
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