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p in (-oo:+oo)
(-1/5)*p+(9/5)*p+6 = 30 // - 30
(-1/5)*p+(9/5)*p-30+6 = 0
8/5*p-24 = 0 // + 24
8/5*p = 24 // : 8/5
p = 24/8/5
p = 15
p = 15
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