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m in (-oo:+oo)
-15 = (-4*m)/5 // - (-4*m)/5
-((-4*m)/5)-15 = 0
(4/5)*m-15 = 0
4/5*m-15 = 0 // + 15
4/5*m = 15 // : 4/5
m = 15/4/5
m = 75/4
m = 75/4
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