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x in (-oo:+oo)
Y = 1/8-(3*x)-2 // - 1/8-(3*x)-2
Y+3*x-(1/8)+2 = 0
Y+3*x-1/8+2 = 0
Y+3*x+15/8 = 0 // - Y+15/8
3*x = -(Y+15/8) // : 3
x = (-(Y+15/8))/3
x = (-(Y+15/8))/3
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