\[ \frac{x-4.1}{2.5} = \frac{x+0.8}{5} \]
\[ 5 \cdot \frac{x-4.1}{2.5} = 5 \cdot \frac{x+0.8}{5} \]
\[ 2(x-4.1) = x+0.8 \]
\[ 2x - 8.2 = x + 0.8 \]
\[ 2x - x = 0.8 + 8.2 \]
\[ x = 9 \]
Ответ: При x = 9.