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M in (-oo:+oo)
M/(-5) < 4 // - 4
M/(-5)-4 < 0
-1/5*M-4 < 0 // + 4
-1/5*M < 4 // : -1/5
M > 4/(-1/5)
M > -20
M in (-20:+oo)
(-20:+oo)
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