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x in (-oo:+oo)
Y = (-1/2)*x-12 // - (-1/2)*x-12
Y-((-1/2)*x)+12 = 0
Y+(1/2)*x+12 = 0
Y+1/2*x+12 = 0 // - Y+12
1/2*x = -(Y+12) // : 1/2
x = (-(Y+12))/1/2
x = -2*(Y+12)
x = -2*(Y+12)
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