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Sagot :
To solve this, we need to be clear about the rule of the signs. When we have equaled signs, the result for the product of them is always positive:
+ * + = +
- * - = +
For different signs we have:
+ * - = -
- * + = -
In this case, we have:
[tex]6-(-7)=6+7=13[/tex]The product of the two minus signs (one in front of the parenthesis) results in a + sign. It is transformed in +, and then the operation is a sum of two numbers, resulting in 13.
Therefore, 6-(-7) = 6 + 7 = 13.
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