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x in (-oo:+oo)
y-4 = (5/2)*(x-1) // - (5/2)*(x-1)
y-((5/2)*(x-1))-4 = 0
(-5/2)*(x-1)+y-4 = 0
y-5/2*(x-1)-4 = 0
y-5/2*(x-1)-4 = 0
y-5/2*x-4+5/2 = 0
y-5/2*x-3/2 = 0
y-5/2*x-3/2 = 0
y-5/2*x-3/2 = 0 // - y-3/2
-5/2*x = -(y-3/2) // : -5/2
x = (-(y-3/2))/(-5/2)
x = -2/5*(3/2-y)
x = -2/5*(3/2-y)
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