You have an operator missing between the 3 and 2. Putting the 4 standard operators in, these are the answers:
7 + 8 - 3 + 2 - 5 + 10 = 19
7 + 8 - 3 - 2 - 5 + 10 = 15
7 + 8 - 3 x 2 - 5 + 10 = 14
7 + 8 - 3 ÷ 2 - 5 + 10 = 18.5
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2+2+2+10+5+5+5+20+20+20+20+20+20=151
It is: (5+2)*10 = 70
2 and 7/10 + 5 and 3/10 = 8
It is: (2+10) times 5 = 60
1/2 + 2/5 = 5/10 + 4/10 = 9/10 :)