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