Calculate 1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9-66=?
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1
Answer:
3+7+11+15+10+5+9+13+17+3+7+11+15+9-66
10+18+25+15+22+20+10+26+9-66
28+40+42+30+25-66
68+72+25-66
140+25-66
165-66
99
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