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x in (-oo:+oo)
(2*x)/y+6 = -4 // + 4
(2*x)/y+4+6 = 0
2*x*y^-1+10 = 0 // - 10
2*x*y^-1 = -10 // : 2*y^-1
x = -10/(2*y^-1)
x = -5*y
x = -5*y
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