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