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x in (-oo:+oo)
(-7/2)*x-4+1 = -6/y-2 // + -6/y-2
(-7/2)*x-(-6/y)-4+1+2 = 0
(-7/2)*x+6*y^-1-4+1+2 = 0
6*y^-1-7/2*x-1 = 0 // - 6*y^-1-1
-7/2*x = -(6*y^-1-1) // : -7/2
x = (-(6*y^-1-1))/(-7/2)
x = -2/7*(1-(6*y^-1))
x = -2/7*(1-(6*y^-1))
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