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x in (-oo:+oo)
Y = 6-((2/3)*x) // - 6-((2/3)*x)
Y+(2/3)*x-6 = 0
Y+2/3*x-6 = 0 // - Y-6
2/3*x = -(Y-6) // : 2/3
x = (-(Y-6))/2/3
x = 3/2*(6-Y)
x = 3/2*(6-Y)
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