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P in (-oo:+oo)
P/7 > 6 // - 6
P/7-6 > 0
1/7*P-6 > 0 // + 6
1/7*P > 6 // : 1/7
P > 6/1/7
P > 42
P in (42:+oo)
(42:+oo)
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