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m in (-oo:+oo)
15 = (5/3)*m // - (5/3)*m
15-((5/3)*m) = 0
(-5/3)*m+15 = 0
15-5/3*m = 0 // - 15
-5/3*m = -15 // : -5/3
m = -15/(-5/3)
m = 9
m = 9
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