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Subtracting real numbers

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I always get stuck because I never know where to start, and the signs confuse me.

Here's the problem:

Here's my first step...

But, that's not right. I checked in the back of the book for the answer, and the answer is -26. I know I didn't do it right, because I struggled with it too much.

Can someone please lead me, and show me what I did wrong?


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