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x in (-oo:+oo)
p = 7*(4/7)*(q-28) // - 7*(4/7)*(q-28)
p-(7*(4/7)*(q-28)) = 0
p-4*(q-28) = 0
p-4*(q-28) = 0
p-4*q+112 = 0
p-4*q+112 = 0
x belongs to the empty set
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