хn=3n-18n/10 x10=

To solve for \( x_n = \frac{3n - 18n}{10} \), we first simplify the expression.

1. Simplify inside the parentheses: \[ 3n - 18n = -15n \]

2. Now the equation becomes: \[ x_n = \frac{-15n}{10} \]

3. Simplify the fraction: \[ x_n = -\frac{15n}{10} = -\frac{3n}{2} \]

Now we can find \( x_{10} \): \[ x_{10} = -\frac{3 \cdot 10}{2} = -\frac{30}{2} = -15 \]

Thus, \( x_{10} = -15 \).