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x in (-oo:+oo)
x/6-x-(1/2) = x-13 // - x-13
x/6-x-x-(1/2)+13 = 0
x/6-x-x-1/2+13 = 0
25/2-11/6*x = 0 // - 25/2
-11/6*x = -25/2 // : -11/6
x = -25/2/(-11/6)
x = 75/11
x = 75/11
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