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m in (-oo:+oo)
75 = 15*(m/4) // - 15*(m/4)
75-(15*(m/4)) = 0
(-15/4)*m+75 = 0
75-15/4*m = 0 // - 75
-15/4*m = -75 // : -15/4
m = -75/(-15/4)
m = 20
m = 20
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