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m in (-oo:+oo)
4*(-5*m-1) = -104 // + 104
4*(-5*m-1)+104 = 0
4*(-5*m-1)+104 = 0
100-20*m = 0
100-20*m = 0
100-20*m = 0 // - 100
-20*m = -100 // : -20
m = -100/(-20)
m = 5
m = 5
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