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x in (-oo:+oo)
Y = 12-((6*x)/(-2)) // - 12-((6*x)/(-2))
Y+(6*x)/(-2)-12 = 0
Y-3*x-12 = 0 // - Y-12
-3*x = -(Y-12) // : -3
x = (-(Y-12))/(-3)
x = (12-Y)/(-3)
x = (12-Y)/(-3)
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