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+5+-6=-1
+4+3+-4=+3
+9+2=+11
+10+6+-5=+11
+5+9=+14
+2+4=+6
+12+8+-2=+18
+8+2+-6=+4
+2+10+-8=+4
+14+2+-2=+14
resta
+2-4=-2
+6-3=+3
+10-5=+5
+8-10=-2
-12+6=-6
20-12=-8
30-40=-10
50-25=+25
30-15=+15
100-50(10)=-400