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x in (-oo:+oo)
y = (-1/5)*x-3 // - (-1/5)*x-3
y-((-1/5)*x)+3 = 0
(1/5)*x+y+3 = 0
1/5*x+y+3 = 0 // - y+3
1/5*x = -(y+3) // : 1/5
x = (-(y+3))/1/5
x = -5*(y+3)
x = -5*(y+3)
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