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x in (-oo:+oo)
y = (1/5)*x-4 // - (1/5)*x-4
y-((1/5)*x)+4 = 0
(-1/5)*x+y+4 = 0
y-1/5*x+4 = 0 // - y+4
-1/5*x = -(y+4) // : -1/5
x = (-(y+4))/(-1/5)
x = 5*(y+4)
x = 5*(y+4)
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