Răspuns:
[tex]x + 21.7 = 42.3 \\ x = 42.3 - 21.7 \\ x = 20.6 \\ 20.6 + 21.7 = 42.3 \\ \\ \\ x - 3.56 = 9.7 \\ x = 9.7 + 3.56 \\ x = 13.26 \\ 13.26 - 3.56 = 9.7 \\ \\ \\ x \div 2.7 = 7.23 \\ x = 7.23 \times 2.7 \\ x = 19.521 \\ 19.521 + \div 2.7 = 7.23[/tex]
