\[- 10,28 + x + 4,3 + 7,28 + ( - 4,3) = x - 3\]
\[x = 1\frac{5}{11}:\]
\[1\frac{5}{11} - 3 = - 2\frac{11}{11} + 1\frac{5}{11} = - 1\frac{6}{11}.\]