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m in (-oo:+oo)
-14 = (7/9)*m // - (7/9)*m
-((7/9)*m)-14 = 0
(-7/9)*m-14 = 0
-7/9*m-14 = 0 // + 14
-7/9*m = 14 // : -7/9
m = 14/(-7/9)
m = -18
m = -18
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