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p in (-oo:+oo)
(-1/5)*p+(9/5)*p = 30 // - 30
(-1/5)*p+(9/5)*p-30 = 0
8/5*p-30 = 0 // + 30
8/5*p = 30 // : 8/5
p = 30/8/5
p = 75/4
p = 75/4
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