Add like terms
7a + 2a
What is 9a
2a + 4 + 3a
What is 5a + 4
4a - 2a
What is 2a
7a -4a +3b
what is 3a + 3b
4 (2 + 3b)
What is 8 +12b
b + 4 for b=2
What is 6
3b + 6b
What is 9b
3b + 4a + 6a + 2b
What is 10a + 5b
12b-10b
what is 2b
10b-8b+9
What is 2b+9
2 ( 2a + 4b)
What is 4a + 8b
b +10 for b=10
What is 20
10b +20b
What is 30b
5 + 3b + 10
What is 3b+15
25b-20b
What is 5b
10b - 5b + 4a -2a
what is 5b+2a
6 (3 +2b)
What is 18 + 12b
b - 5 for b=8
What is 3
5b + 4b + 3b
What is 12b
2a + 4b + 5a + 3b
what is 7a + 7b
100b -90b
What is 10b
5b - 2b + 6a -3a
What is 3a +3b
3(4a+4b)
What is 12a +12b
2b + 4 for b=3
what is 10
what is 60b
12a + 10 + 20 + 8a
what is 20a +30
300b -200b
what is 100b
10b - 9b + 8a-7a
What is 1a +1b
10(3a+5b)
What is 30a +50b
3b - 30 for b=10
what is zero