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x in (-oo:+oo)
7*x = 6*x-(14/y) // - 6*x-(14/y)
7*x-(6*x)+14/y = 0
7*x-6*x+14/y = 0
x+14*y^-1 = 0 // - 14*y^-1
x = -(14*y^-1)
x = -14*y^-1
x = -14*y^-1
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