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x in (-oo:+oo)
Y = 12-((3*x)/2) // - 12-((3*x)/2)
Y+(3*x)/2-12 = 0
Y+3/2*x-12 = 0 // - Y-12
3/2*x = -(Y-12) // : 3/2
x = (-(Y-12))/3/2
x = 2/3*(12-Y)
x = 2/3*(12-Y)
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