16) -9; -6; -3; 3; 6; 9; 12; 15; 18
17) 13+23+8+18=62
18) 9+17+25+33=84
19)
20)62<x+65≤68
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16) -9; -6; -3; 3; 6; 9; 12; 15; 18
17) 13+23+8+18=62
18) 9+17+25+33=84
19)
20)62<x+65≤68