Tick only one option. Which of the following is equal to -6?
2+4
-3-9
+3-9
3-(-9)
∙ 2+4=6≠-6
∙ -3-9=-12≠-6
∙+3-9=-6
∙3-(-9)=3+9=12≠-6
Hence, correct option is (C).
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