10:7-2

To solve the expression \(10:7 - 2\), we first need to interpret the notation. The colon (:) usually indicates division in some contexts, so we can rewrite it as:

\[ \frac{10}{7} - 2 \]

Now calculate \(\frac{10}{7}\):

\[ \frac{10}{7} \approx 1.4286 \]

Next, subtract 2:

\[ 1.4286 - 2 \approx -0.5714 \]

Therefore, \(10:7 - 2 \approx -0.5714\). If you require a more precise fraction:

\[ \frac{10}{7} - 2 = \frac{10}{7} - \frac{14}{7} = \frac{10 - 14}{7} = \frac{-4}{7} \]

So, the exact answer is \(\frac{-4}{7}\).