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x in (-oo:+oo)
y = (-3/8)*x-9 // - (-3/8)*x-9
y-((-3/8)*x)+9 = 0
(3/8)*x+y+9 = 0
3/8*x+y+9 = 0 // - y+9
3/8*x = -(y+9) // : 3/8
x = (-(y+9))/3/8
x = -8/3*(y+9)
x = -8/3*(y+9)
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