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