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x in (-oo:+oo)
y = (-3/5)*x-4 // - (-3/5)*x-4
y-((-3/5)*x)+4 = 0
(3/5)*x+y+4 = 0
3/5*x+y+4 = 0 // - y+4
3/5*x = -(y+4) // : 3/5
x = (-(y+4))/3/5
x = -5/3*(y+4)
x = -5/3*(y+4)
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