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[tex]x - 4 \frac{3}{7} = 3 \frac{5}{6} \\ x = \frac{23}{6} + \frac{31}{7} = \frac{161 + 186}{42} = \frac{329}{42} = \frac{47}{6} \\ 6 \frac{8}{15} + 4 \frac{5}{18} - 3.6 = \frac{98}{15} + \frac{77}{18} - \frac{36}{10} = \frac{5880}{900} + \frac{3850}{900} - \frac{3240 }{900} = \frac{6490}{900} = \frac{3245}{450} = \frac{649}{90} [/tex]