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x in (-oo:+oo)
g = (7/4)*(p-21) // - (7/4)*(p-21)
g-((7/4)*(p-21)) = 0
(-7/4)*(p-21)+g = 0
g-7/4*(p-21) = 0
g-7/4*(p-21) = 0
g-7/4*p+147/4 = 0
g-7/4*p+147/4 = 0
x belongs to the empty set
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