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