Dati factor comun in urmatoarele expresii:
8a+8b
15a-7a
6x+6y-6z
50a-25a
3x+5x-2x
12a-16b
18x-12z+24t
9x+9y+9z-9a
5x+10y-15a
18a-27b
8xy-8xz
3xa+5xa-2xa
​