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