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x in (-oo:+oo)
P/4-((3*p)/8) = 4 // - 4
P/4-((3*p)/8)-4 = 0
P/4+(-3/8)*p-4 = 0
1/4*P-3/8*p-4 = 0
x należy do R
x in (-oo:+oo)
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