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x in (-oo:+oo)
y = (-5/2)*x-16 // - (-5/2)*x-16
y-((-5/2)*x)+16 = 0
(5/2)*x+y+16 = 0
5/2*x+y+16 = 0 // - y+16
5/2*x = -(y+16) // : 5/2
x = (-(y+16))/5/2
x = -2/5*(y+16)
x = -2/5*(y+16)
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