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x in (-oo:+oo)
Y = x/2-6 // - x/2-6
Y-(x/2)+6 = 0
Y-1/2*x+6 = 0 // - Y+6
-1/2*x = -(Y+6) // : -1/2
x = (-(Y+6))/(-1/2)
x = 2*(Y+6)
x = 2*(Y+6)
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