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m in (-oo:+oo)
-15 = (5*m)/7 // - (5*m)/7
-((5*m)/7)-15 = 0
(-5/7)*m-15 = 0
-5/7*m-15 = 0 // + 15
-5/7*m = 15 // : -5/7
m = 15/(-5/7)
m = -21
m = -21
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