Question

Choose a number and add 5 to it. Multiply it by 2. Subtract by 7 and add 1. Divide by 2. Subtract 2. Will you get your starting number every time?

Answer 1

8+5=13
13*2=26
26-7=19
19+1=20
20/2=10
10-2=8

100+5=105
105*2=210
210-7=203
203+1=204
204/2=102
102-2=100

4256+5=4261
4261*2=8522
8522-7=8515
8515+1=8516
8516/2=4258
4258-2=4256

Yes, I tested it 3 times with 3 different numbers.