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x in (-oo:+oo)
5*x = 320/y // - 320/y
5*x-(320/y) = 0
5*x-320*y^-1 = 0
5*x-320*y^-1 = 0 // + -320*y^-1
5*x = -(-320*y^-1) // : 5
x = (-(-320*y^-1))/5
x = 64*y^-1
x = 64*y^-1
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