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m in (-oo:+oo)
-9 = (4/5)*m // - (4/5)*m
-((4/5)*m)-9 = 0
(-4/5)*m-9 = 0
-4/5*m-9 = 0 // + 9
-4/5*m = 9 // : -4/5
m = 9/(-4/5)
m = -45/4
m = -45/4
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