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x in (-oo:+oo)
y+4 = (5/2)*(x+2) // - (5/2)*(x+2)
y-((5/2)*(x+2))+4 = 0
(-5/2)*(x+2)+y+4 = 0
y-5/2*(x+2)+4 = 0
y-5/2*(x+2)+4 = 0
y-5/2*x-5+4 = 0
y-5/2*x-1 = 0
y-5/2*x-1 = 0
y-5/2*x-1 = 0 // - y-1
-5/2*x = -(y-1) // : -5/2
x = (-(y-1))/(-5/2)
x = -2/5*(1-y)
x = -2/5*(1-y)
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