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r in (-oo:+oo)
6 > r/(-2) // - r/(-2)
6-(r/(-2)) > 0
1/2*r+6 > 0 // - 6
1/2*r > -6 // : 1/2
r > -6/1/2
r > -12
r in (-12:+oo)
(-12:+oo)
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