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m in (-oo:+oo)
-(5*m)-10 = -50 // + 50
50-(5*m)-10 = 0
50-5*m-10 = 0
40-5*m = 0 // - 40
-5*m = -40 // : -5
m = -40/(-5)
m = 8
m = 8
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