If a = 1 b=5
a + b
6
If a = 9 b=5
a - b
4
a x b
5
2a + 5b
27
3b - 4a
11
ab - b
0
If a = 3 b=9
3(a + b)
36
3(2a + b)
45
ab + 4a
39
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