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x in (-oo:+oo)
y = (-3/4)*x-6 // - (-3/4)*x-6
y-((-3/4)*x)+6 = 0
(3/4)*x+y+6 = 0
3/4*x+y+6 = 0 // - y+6
3/4*x = -(y+6) // : 3/4
x = (-(y+6))/3/4
x = -4/3*(y+6)
x = -4/3*(y+6)
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