Factorise Fully

Question 1:

7v56
7 v8

Question 2:

35b30
5 7b6

Question 3:

6z+4
2 3z+2

Question 4:

9x25x
x 9x5

Question 5:

3az+5a
a 3z+5

Question 6:

27f224fj
3f 9f8j