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x in (-oo:+oo)
(8/5)*y = (2/5)*x+1 // - (2/5)*x+1
(8/5)*y-((2/5)*x)-1 = 0
(-2/5)*x+(8/5)*y-1 = 0
8/5*y-2/5*x-1 = 0 // - 8/5*y-1
-2/5*x = -(8/5*y-1) // : -2/5
x = (-(8/5*y-1))/(-2/5)
x = -5/2*(1-(8/5*y))
x = -5/2*(1-(8/5*y))
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