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x in (-oo:+oo)
11*x-(1/2) = 13*x-(1/3) // - 13*x-(1/3)
11*x-(13*x)-(1/2)+1/3 = 0
11*x-13*x-1/2+1/3 = 0
-2*x-1/6 = 0 // + 1/6
-2*x = 1/6 // : -2
x = 1/6/(-2)
x = -1/12
x = -1/12
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