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m in (-oo:+oo)
-((7/2)*(m-2)) < 21 // - 21
-((7/2)*(m-2))-21 < 0
(-7/2)*(m-2)-21 < 0
-7/2*(m-2)-21 < 0
-7/2*(m-2)-21 < 0
-7/2*m-14 < 0
-7/2*m-14 < 0
-7/2*m-14 < 0 // + 14
-7/2*m < 14 // : -7/2
m > 14/(-7/2)
m > -4
(-oo:-4) (-4:+oo) -7/2*m-14 + -
m in (-4:+oo)
(-4:+oo)
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