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p in (-oo:+oo)
7*p-(p/3) = (20*p)/3+2 // - (20*p)/3+2
7*p-(p/3)-((20*p)/3)-2 = 0
7*p-(p/3)+(-20/3)*p-2 = 0
-2 = 0
p belongs to the empty set
p belongs to the empty set
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