Sum of 1-2+3-4+5 upto 30
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1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20+21-22+23-24+25-26+27-28+29-30
= finally the answer is -15
every number after subtracted remained -1 so I add -1 15 times
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