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r in (-oo:+oo)
r/4-5 > -6 // + 6
r/4-5+6 > 0
1/4*r+1 > 0 // - 1
1/4*r > -1 // : 1/4
r > -1/1/4
r > -4
r in (-4:+oo)
(-4:+oo)
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