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x in (-oo:+oo)
y = (-2/3)*x-4 // - (-2/3)*x-4
y-((-2/3)*x)+4 = 0
(2/3)*x+y+4 = 0
2/3*x+y+4 = 0 // - y+4
2/3*x = -(y+4) // : 2/3
x = (-(y+4))/2/3
x = -3/2*(y+4)
x = -3/2*(y+4)
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