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m in (-oo:+oo)
(1/2)*m+(4/5)*m+3/10 = -1 // + 1
(1/2)*m+(4/5)*m+3/10+1 = 0
13/10*m+13/10 = 0 // - 13/10
13/10*m = -13/10 // : 13/10
m = -13/10/13/10
m = -1
m = -1
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