Решение:
1 \(\frac{10}{43}\) = \(\frac{1*43+10}{43}\) = \(\frac{53}{43}\)
5 \(\frac{39}{43}\) = \(\frac{5*43+39}{43}\) = \(\frac{215+39}{43}\) = \(\frac{254}{43}\)
6 \(\frac{27}{43}\) = \(\frac{6*43+27}{43}\) = \(\frac{258+27}{43}\) = \(\frac{285}{43}\)
20 \(\frac{2}{43}\) = \(\frac{20*43+2}{43}\) = \(\frac{860+2}{43}\) = \(\frac{862}{43}\)
27 - \(\frac{53}{43}\) - \(\frac{254}{43}\) + x - \(\frac{285}{43}\) = \(\frac{862}{43}\)
-\(\frac{53+254+285}{43}\) = -\(\frac{592}{43}\)
x = \(\frac{862}{43}\) + \(\frac{592}{43}\) - 27
x = \(\frac{862+592}{43}\) - \(\frac{27*43}{43}\)
x = \(\frac{1454}{43}\) - \(\frac{1161}{43}\)
x = \(\frac{1454-1161}{43}\) = \(\frac{293}{43}\)
\(\frac{293}{43}\) = 6 \(\frac{35}{43}\)
Ответ: 6 \(\frac{35}{43}\)