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m in (-oo:+oo)
(3/5)*m = -3/10 // + -3/10
(3/5)*m-(-3/10) = 0
(3/5)*m+3/10 = 0
3/5*m+3/10 = 0 // - 3/10
3/5*m = -3/10 // : 3/5
m = -3/10/3/5
m = -1/2
m = -1/2
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