A. Perform the indicated operation.
9m+3
7m
1. +
20 2c
15x+18
2x-25
6.
m+n
m+n
18a
12a
2. +
m+n
10a-5b
7.
17
5a+8
17
m+n
7x-18y 12x+9y
3.
+
a+b
a+b
13x-14
8.
ху
x-12
==
ху
24x-17
3x+28
20g+1 139-6
4. +
3
3
9.
24z
24z
8b-9c
5b-8c
16p-25
28p-32
5.
+
x+y x+y
10.
5
5