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x in (-oo:+oo)
-y-1 = (2/5)*x // - (2/5)*x
-((2/5)*x)-y-1 = 0
(-2/5)*x-y-1 = 0
-2/5*x-y-1 = 0 // + -y-1
-2/5*x = -(-y-1) // : -2/5
x = (-(-y-1))/(-2/5)
x = -5/2*(y+1)
x = -5/2*(y+1)
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