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v in (-oo:+oo)
v/6 > 15 // - 15
v/6-15 > 0
1/6*v-15 > 0 // + 15
1/6*v > 15 // : 1/6
v > 15/1/6
v > 90
v in (90:+oo)
(90:+oo)
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