\[ \frac{5(5a-1)}{15} = \frac{3(2a-3)}{15} - \frac{15}{15} \]
\[ 5(5a-1) = 3(2a-3) - 15 \]
\[ 25a - 5 = 6a - 9 - 15 \]
\[ 25a - 6a = -9 - 15 + 5 \]19a = -19
\[ a = \frac{-19}{19} \]a = -1
Ответ: a = -1