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x in (-oo:+oo)
y = (-1/4)*x-5 // - (-1/4)*x-5
y-((-1/4)*x)+5 = 0
(1/4)*x+y+5 = 0
1/4*x+y+5 = 0 // - y+5
1/4*x = -(y+5) // : 1/4
x = (-(y+5))/1/4
x = -4*(y+5)
x = -4*(y+5)
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