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x in (-oo:+oo)
((3*x)/2)*y = 2/5 // - 2/5
((3*x)/2)*y-(2/5) = 0
((3*x)/2)*y-2/5 = 0
3/2*x*y-2/5 = 0 // + 2/5
3/2*x*y = 2/5 // : 3/2*y
x = 2/5/(3/2*y)
x = 4/15*y^-1
x = 4/15*y^-1
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