Resposta:
+2-[ 21+( -20-15 ) +23] =
+2-[21+(-35)+23] =
+2-[21-35+23] =
+2- [9] =
+2 -9 = -7
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Resposta:
+2-[ 21+( -20-15 ) +23] =
+2-[21+(-35)+23] =
+2-[21-35+23] =
+2- [9] =
+2 -9 = -7