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p in (-oo:+oo)
4*p-(28/3) = 4 // - 4
4*p-(28/3)-4 = 0
4*p-28/3-4 = 0
4*p-40/3 = 0 // + 40/3
4*p = 40/3 // : 4
p = 40/3/4
p = 10/3
p = 10/3
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