Решите уравнение: (3x-15)/2,1=(25-x)/2,8.

\[\frac{3x - 15}{2,1} = \frac{25 - x}{2,8}\]

\[2,8(3x - 15) = 2,1(25 - x)\]

\[8,4x - 42 = 52,5 - 2,1x\]

\[10,5x = 94,5\]

\[x = 94,5\ :10,5\]

\[x = \frac{945}{105}\]

\[x = 9.\]