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x in (-oo:+oo)
y = (-1/4)*x-(3/4) // - (-1/4)*x-(3/4)
y-((-1/4)*x)+3/4 = 0
(1/4)*x+y+3/4 = 0
1/4*x+y+3/4 = 0 // - y+3/4
1/4*x = -(y+3/4) // : 1/4
x = (-(y+3/4))/1/4
x = -4*(y+3/4)
x = -4*(y+3/4)
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