Решите уравнение: 7/15+x=12/15.

Ответ:

\[\frac{7}{15} + x = \frac{12}{15}\]

\[x = \frac{12}{15} - \frac{7}{15}\]

\[x = \frac{5}{15}\]

\[x = \frac{1}{3}.\]