AYUDA.
-7+{10-[6-(8-10)+3(-3+4)-15]-17} =
-7+{10-[6-(8-10)+3(-3+4)-15]-17} =
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-7+{10-[6-8+10-9+12-15]-17} =
-7+{10-6+8-10+9-12+15-17} =
-7+10-6+8-10+9-12+15-17=
suma de +: +10+8+9+15 = +42
suma de - : -7-6-10-12-17= -52
+42 - 52 = -10