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x in (-oo:+oo)
(7*x)/y = 41 // - 41
(7*x)/y-41 = 0
7*x*y^-1-41 = 0 // + 41
7*x*y^-1 = 41 // : 7*y^-1
x = 41/(7*y^-1)
x = 41/(7*y^-1)
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