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x in (-oo:+oo)
x-(5/y) = -3/7 // + -3/7
x-(5/y)-(-3/7) = 0
x-5*y^-1+3/7 = 0
x-5*y^-1+3/7 = 0 // - 3/7-5*y^-1
x = -(3/7-5*y^-1)
x = -(3/7-5*y^-1)
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