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x in (-oo:+oo)
y = (-8/5)*x-1 // - (-8/5)*x-1
y-((-8/5)*x)+1 = 0
(8/5)*x+y+1 = 0
8/5*x+y+1 = 0 // - y+1
8/5*x = -(y+1) // : 8/5
x = (-(y+1))/8/5
x = -5/8*(y+1)
x = -5/8*(y+1)
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