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x in (-oo:+oo)
y = (-7/5)*x-(1/5) // - (-7/5)*x-(1/5)
y-((-7/5)*x)+1/5 = 0
(7/5)*x+y+1/5 = 0
7/5*x+y+1/5 = 0 // - y+1/5
7/5*x = -(y+1/5) // : 7/5
x = (-(y+1/5))/7/5
x = -5/7*(y+1/5)
x = -5/7*(y+1/5)
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