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x in (-oo:+oo)
P = (6/7)*(3*w+5) // - (6/7)*(3*w+5)
P-((6/7)*(3*w+5)) = 0
(-6/7)*(3*w+5)+P = 0
P-6/7*(3*w+5) = 0
P-6/7*(3*w+5) = 0
P-18/7*w-30/7 = 0
P-18/7*w-30/7 = 0
x belongs to the empty set
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