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x in (-oo:+oo)
(3/2)*y = (4/5)*x // - (4/5)*x
(3/2)*y-((4/5)*x) = 0
(-4/5)*x+(3/2)*y = 0
3/2*y-4/5*x = 0 // - 3/2*y
-4/5*x = -(3/2*y) // : -4/5
x = (-(3/2*y))/(-4/5)
x = 15/8*y
x = 15/8*y
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