-15<x<12
-14-13-12-11-10-11-10-9-8-7-6-5-4-3-2-1+0+1+2+3+4+5+6+7+8+9+10+11=-39
-13+13=0 -12+12=0 .... -14-13-12=-39
-39*5=-195
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-15<x<12
-14-13-12-11-10-11-10-9-8-7-6-5-4-3-2-1+0+1+2+3+4+5+6+7+8+9+10+11=-39
-13+13=0 -12+12=0 .... -14-13-12=-39
-39*5=-195