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