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You haven't stated the question. We'll assume that

what you're looking for is the value of the sum.

In preparation, we reflect:

Since 12 cows - 3 cows + 8 cows + 10 = 17 cows + 10,

12 sqrt(2) - 3 sqrt(2) + 8 sqrt(2) + 10 = 17 sqrt(2) + 10

If you need the actual numerical value, we go a step further:

17 sqrt(2) + 10 = 24.0416 + 10 = 34.0416(rounded)

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Q: How do you answer 12 square root 2 - 3 square root 2 plus 8 square root 2 plus 10 showing all the work?
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