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x in (-oo:+oo)
(f-7)/g = h // - h
(f-7)/g-h = 0
(f-7)/g+(g*(-h))/g = 0
f+g*(-h)-7 = 0
f-(g*h)-7 = 0
(f-(g*h)-7)/g = 0
(f-(g*h)-7)/g = 0 // * g
f-(g*h)-7 = 0
x belongs to the empty set
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