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m in (-oo:+oo)
4/5 = (7/9)*m // - (7/9)*m
4/5-((7/9)*m) = 0
(-7/9)*m+4/5 = 0
4/5-7/9*m = 0 // - 4/5
-7/9*m = -4/5 // : -7/9
m = -4/5/(-7/9)
m = 36/35
m = 36/35
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