-8+9-10+11-12+13-14+15=1+1+1+1=4
-12+13-18-13+24-36= -42
34+16-25+18-34+43-12=40
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-8+9-10+11-12+13-14+15=1+1+1+1=4
-12+13-18-13+24-36= -42
34+16-25+18-34+43-12=40