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Ley de signos: - x - = +; + x - = -
-(-9) = +9
-(-3) = +3
+(-6) = -6
9 + 5 + 3 - 6 - 6 - 9 + 10
Podemos sumar los positivos
=> 9 + 5 + 3 + 10 = 27
Podemos restar los negativos
=> - 6 - 6 - 9 = -21
Finalmente: 27 - 21 = 6
- (-9) +5 - (-3) -6 + (-6) -9+10 = 6