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