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p in (-oo:+oo)
8/3-((7*p)/4) = -((-9*p)/4+4/3) // + (-9*p)/4+4/3
(-9*p)/4-((7*p)/4)+8/3+4/3 = 0
(-7/4)*p+(-9*p)/4+8/3+4/3 = 0
4-4*p = 0 // - 4
-4*p = -4 // : -4
p = -4/(-4)
p = 1
p = 1
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