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