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x in (-oo:+oo)
x-(5/y) = 18 // - 18
x-(5/y)-18 = 0
x-5*y^-1-18 = 0
x-5*y^-1-18 = 0 // + -5*y^-1-18
x = -(-5*y^-1-18)
x = 18-(-5*y^-1)
x = 18-(-5*y^-1)
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