Integer Addition & Subtraction

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`\(+9\) + \(-4\) =`

`\(-7\) + \(-5\) =`

`\(-10\) + \(+5\) =`

`\(+9\) + \(+8\) =`

`\(+11\) - \(-6\) =`

`\(-17\) - \(+5\) =`

`\(-12\) - \(-8\) =`

`\(+20\) - \(+15\) =`