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x in (-oo:+oo)
y-7 = (5/8)*x-(20/8) // - (5/8)*x-(20/8)
y-((5/8)*x)+20/8-7 = 0
(-5/8)*x+y+20/8-7 = 0
y-5/8*x-9/2 = 0 // - y-9/2
-5/8*x = -(y-9/2) // : -5/8
x = (-(y-9/2))/(-5/8)
x = -8/5*(9/2-y)
x = -8/5*(9/2-y)
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