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x in (-oo:+oo)
(3*x)/y = -4 // + 4
(3*x)/y+4 = 0
3*x*y^-1+4 = 0 // - 4
3*x*y^-1 = -4 // : 3*y^-1
x = -4/(3*y^-1)
x = -4/(3*y^-1)
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