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x in (-oo:+oo)
y-1 = (5/8)*x-4 // - (5/8)*x-4
y-((5/8)*x)-1+4 = 0
(-5/8)*x+y-1+4 = 0
y-5/8*x+3 = 0 // - y+3
-5/8*x = -(y+3) // : -5/8
x = (-(y+3))/(-5/8)
x = 8/5*(y+3)
x = 8/5*(y+3)
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