$$ 12 . \quad \frac { 10 } { 2 } - ( \frac { 15 } { 5 } ) - ( - \frac { 18 } { 3 } ) = $$

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Let's solve the expression step by step:

$$
\frac{10}{2} - \left(\frac{15}{5}\right) - \left(-\frac{18}{3}\right)
$$

1. **Calculate each fraction:**
   $$
   \frac{10}{2} = 5
   $$
   $$
   \frac{15}{5} = 3
   $$
   $$
   \frac{18}{3} = 6 \quad \text{so} \quad -\frac{18}{3} = -6
   $$

2. **Substitute the calculated values back into the expression:**
   $$
   5 - 3 - (-6)
   $$

3. **Simplify the expression:**
   $$
   5 - 3 + 6 = 8
   $$

**Final Answer:**
$$
8
$$
The final answer is 8.

\( 12 . \quad \frac { 10 } { 2 } - ( \frac { 15 } { 5 } ) - ( - \frac { 18 } { 3 } ) = \)

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