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