Математика: Поогите дам 100 баллов номер 751 пж помогите

1)
$1.8 - ( 2 \frac{3}{5} - (x - 1.2)) = 3 \\ \frac{18}{10} - ( \frac{13}{5} - x + \frac{12}{10} ) = 3 \\ \frac{18}{10} - \frac{13}{5} + x - \frac{12}{10} = 3 \\ x = \frac{3}{1} - \frac{18}{10} + \frac{13}{5} + \frac{12}{10} \\ x = \frac{30 - 18 + 26 + 12}{10} \\ x = \frac{50}{10} \\ x = 5$
Ответ: В.

2)

$1.9 - (5 \frac{3}{4} - (x + 1)) = 3.15 \\ \frac{19}{10} - ( \frac{23}{4} - x - 1) = \frac{315}{100} \\ \frac{19}{10} - \frac{23}{4} + x + 1 = \frac{315}{100} \\ x = \frac{315}{100} - \frac{19}{10} + \frac{23}{4} - 1 \\ x = \frac{315 - 190 + 575 - 100}{100} \\ x = \frac{600}{100} \\ x = 6$
Ответ: D.