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-{45-28-(3-9)+(5) }
-{45-28-(-6)+(5) }
-{45-28+6+5 }
-{28}
= -28
15-{4+[-5-4+(2-3)]-16}
15-{4+[-5-4+(-1)]-16}
15-{4+[-10]-16}
15-{-22}
= 37
-4+5-{3+4-5-[7+(6+4)-7-6] + 4}
-4+5-{3+4-5-[7+(10)-7-6] + 4}
-4+5-{3+4-5-[4] + 4}
-4+5-{2}
1-2
= -1