-7+[(-3)-(-9)]+{(-4+5)-(-6+5)+10}
-7+[-3+9]+{1-(-1)+10}
-7+[6]+{1+2+10}
-1+13
12
solución: 12
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-7+[(-3)-(-9)]+{(-4+5)-(-6+5)+10}
-7+[-3+9]+{1-(-1)+10}
-7+[6]+{1+2+10}
-1+13
12
solución: 12