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x in (-oo:+oo)
y = (-3/2)*x-6 // - (-3/2)*x-6
y-((-3/2)*x)+6 = 0
(3/2)*x+y+6 = 0
3/2*x+y+6 = 0 // - y+6
3/2*x = -(y+6) // : 3/2
x = (-(y+6))/3/2
x = -2/3*(y+6)
x = -2/3*(y+6)
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