3) x-bpx+bp. ; m 4) c+qy c-2qy n

3) \[\frac{x-bp}{p} - \frac{x+bp}{p} = \frac{x - bp - x - bp}{p} = \frac{-2bp}{p} = -2b\]

4) \[\frac{c+qy}{q} - \frac{c-2qy}{q} = \frac{c + qy - c + 2qy}{q} = \frac{3qy}{q} = 3y\]

Ответ: 3) \(-2b\); 4) \(3y\)