Subtract. Write your answer in simplest form. $$ 10 \sqrt{18}-7 \sqrt{2} $$

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To simplify the expression $$ 10 \sqrt{18} - 7 \sqrt{2} $$, follow these steps:

1. **Simplify $$\sqrt{18}$$:**
   $$
   \sqrt{18} = \sqrt{9 \times 2} = \sqrt{9} \times \sqrt{2} = 3\sqrt{2}
   $$

2. **Substitute back into the original expression:**
   $$
   10 \sqrt{18} - 7 \sqrt{2} = 10 \times 3\sqrt{2} - 7\sqrt{2} = 30\sqrt{2} - 7\sqrt{2}
   $$

3. **Combine like terms:**
   $$
   30\sqrt{2} - 7\sqrt{2} = (30 - 7)\sqrt{2} = 23\sqrt{2}
   $$

**Final Answer:**
$$
23\sqrt{2}
$$
The simplified form of $$ 10 \sqrt{18} - 7 \sqrt{2} $$ is $$ 23\sqrt{2} $$.

Subtract. Write your answer in simplest form.

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