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m in (-oo:+oo)
-3*m-8 = -3/(-20) // + -3/(-20)
-3*m-(-3/(-20))-8 = 0
-3*m-3/20-8 = 0
-3*m-163/20 = 0 // + 163/20
-3*m = 163/20 // : -3
m = 163/20/(-3)
m = -163/60
m = -163/60
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