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