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x in (-oo:+oo)
g = (3*(4-h))/h // - (3*(4-h))/h
g-((3*(4-h))/h) = 0
g-3*h^-1*(4-h) = 0
g-3*h^-1*(4-h) = 0
g-12*h^-1+3 = 0
g-12*h^-1+3 = 0
x belongs to the empty set
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