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p in (-oo:+oo)
4*(20-(4*p))-((3/4)*(4-(16*p))) = 0
4*(20-4*p)+(-3/4)*(4-16*p) = 0
4*(20-4*p)-3/4*(4-16*p) = 0
4*(20-4*p)-3/4*(4-16*p) = 0
77-4*p = 0
77-4*p = 0
77-4*p = 0 // - 77
-4*p = -77 // : -4
p = -77/(-4)
p = 77/4
p = 77/4
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