\[10x - 2 \cdot (4x - 5) = 2x + 10\]
\[10x - 8x + 10 = 2x + 10\]
\[2x - 2x = 10 - 10\]
\[0x = 0\]
\[x - любое\ число.\]
\[Ответ:x - любое\ число.\]