4
�
7
⋅
3
�
5
4n
7
⋅3n
5
 is equivalent to:


7
�
2
7n
2



7
�
1
2
7n
12



7
�
3
5
7n
35



1
2
�
1
2
12n
12



1
2
�
3
5
12n
35