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m in (-oo:+oo)
56/81 = (7/9)*m // - (7/9)*m
56/81-((7/9)*m) = 0
(-7/9)*m+56/81 = 0
56/81-7/9*m = 0 // - 56/81
-7/9*m = -56/81 // : -7/9
m = -56/81/(-7/9)
m = 8/9
m = 8/9
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