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x in (-oo:+oo)
(7*x)/y = 12 // - 12
(7*x)/y-12 = 0
7*x*y^-1-12 = 0 // + 12
7*x*y^-1 = 12 // : 7*y^-1
x = 12/(7*y^-1)
x = 12/(7*y^-1)
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