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m in (-oo:+oo)
(1/5)*m >= -3 // + 3
(1/5)*m+3 >= 0
1/5*m+3 >= 0 // - 3
1/5*m >= -3 // : 1/5
m >= -3/1/5
m >= -15
m in <-15:+oo)
<-15:+oo)
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