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-7 (-25+18, -10+3, -15+8, -20+13, -70+63, -17+10, -24+17, -35+28, -11+4, …
-7
-25+18
-10+3
-15+8
-20+13
-70+63
-17+10
-24+17
-35+28
-11+4
-19+12
-9+2
3+(-10)
-89+82
-140/20
-18+11
-13+6
-280/40
-630/90
-490/70
-350/50