Решите неравенство: 3+x<=8x-(3x+7).

\[3 + x \leq 8x - (3x + 7)\]

\[3 + x \leq 8x - 3x - 7\]

\[3 + x \leq 5x - 7\]

\[x - 5x \leq - 7 - 3\]

\[- 4x \leq - 10\]

\[4x \geq 10\]

\[x \geq 2,5\]

\[Ответ:x \geq 2,5.\]