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m in (-oo:+oo)
-125 = (-5/8)*m // - (-5/8)*m
-((-5/8)*m)-125 = 0
(5/8)*m-125 = 0
5/8*m-125 = 0 // + 125
5/8*m = 125 // : 5/8
m = 125/5/8
m = 200
m = 200
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