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x in (-oo:+oo)
13-(8/14) = x+1/2 // - x+1/2
13-x-(8/14)-(1/2) = 0
13-x-4/7-1/2 = 0
167/14-x = 0 // - 167/14
-x = -167/14 // * -1
x = 167/14
x = 167/14
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