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