$(\frac{12}{47} + x) - \frac{18}{47} = \frac{28}{47}$
$\frac{12}{47} + x = \frac{28}{47} + \frac{18}{47}$
$\frac{12}{47} + x = \frac{46}{47}$
$x = \frac{46}{47} - \frac{12}{47}$
$x = \frac{34}{47}$
Ответ: $x = \frac{34}{47}$

$(x - \frac{19}{32}) + \frac{15}{32} = \frac{17}{32}$
$x - \frac{19}{32} = \frac{17}{32} - \frac{15}{32}$
$x - \frac{19}{32} = \frac{2}{32}$
$x = \frac{2}{32} + \frac{19}{32}$
$x = \frac{21}{32}$
Ответ: $x = \frac{21}{32}$