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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
2*p-24 = 0 // + 24
2*p = 24 // : 2
p = 24/2
p = 12
p = 12
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