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m in (-oo:+oo)
5 = (-1/5)*m // - (-1/5)*m
5-((-1/5)*m) = 0
(1/5)*m+5 = 0
1/5*m+5 = 0 // - 5
1/5*m = -5 // : 1/5
m = -5/1/5
m = -25
m = -25
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