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P in (-oo:+oo)
P-(1/5) < 7/10 // - 7/10
P-(1/5)-(7/10) < 0
P-1/5-7/10 < 0
P-9/10 < 0 // + 9/10
P < 9/10
P in (-oo:9/10)
(-oo:9/10)
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