Respuesta :

MN + NP = MP
3x + x = 6x - 6
4x = 6x - 6
4x - 6x = -6
-2x = - 6
x = -6/-2
x = 3

MN = 3x = 3(3) = 9 <==

Answer:

3

Step-by-step explanation:

.

.

.