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x in (-oo:+oo)
((5*n)/4)*x = 8/y // - 8/y
((5*n)/4)*x-(8/y) = 0
((5*n)/4)*x-8*y^-1 = 0
5/4*n*x-8*y^-1 = 0 // + -8*y^-1
5/4*n*x = -(-8*y^-1) // : 5/4*n
x = (-(-8*y^-1))/(5/4*n)
x = 32/5*n^-1*y^-1
x = 32/5*n^-1*y^-1
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