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x in (-oo:+oo)
y = x-((3/8)*x)+13 // - x-((3/8)*x)+13
(3/8)*x-x+y-13 = 0
y-5/8*x-13 = 0 // - y-13
-5/8*x = -(y-13) // : -5/8
x = (-(y-13))/(-5/8)
x = -8/5*(13-y)
x = -8/5*(13-y)
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