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x in (-oo:+oo)
Y = (1/4)*x-12 // - (1/4)*x-12
Y-((1/4)*x)+12 = 0
Y+(-1/4)*x+12 = 0
Y-1/4*x+12 = 0 // - Y+12
-1/4*x = -(Y+12) // : -1/4
x = (-(Y+12))/(-1/4)
x = 4*(Y+12)
x = 4*(Y+12)
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