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x in (-oo:+oo)
Y = x/4-6 // - x/4-6
Y-(x/4)+6 = 0
Y-1/4*x+6 = 0 // - Y+6
-1/4*x = -(Y+6) // : -1/4
x = (-(Y+6))/(-1/4)
x = 4*(Y+6)
x = 4*(Y+6)
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