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x in (-oo:+oo)
y-8 = (5/4)*(x-4) // - (5/4)*(x-4)
y-((5/4)*(x-4))-8 = 0
(-5/4)*(x-4)+y-8 = 0
y-5/4*(x-4)-8 = 0
y-5/4*(x-4)-8 = 0
y-5/4*x-8+5 = 0
y-5/4*x-3 = 0
y-5/4*x-3 = 0
y-5/4*x-3 = 0 // - y-3
-5/4*x = -(y-3) // : -5/4
x = (-(y-3))/(-5/4)
x = -4/5*(3-y)
x = -4/5*(3-y)
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