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x in (-oo:+oo)
X/6-12 = x/6 // - x/6
X/6-(x/6)-12 = 0
1/6*X-1/6*x-12 = 0 // - 1/6*X-12
-1/6*x = -(1/6*X-12) // : -1/6
x = (-(1/6*X-12))/(-1/6)
x = -6*(12-(1/6*X))
x = -6*(12-(1/6*X))
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