(3-13) : (-17+7)

To solve the expression \((3-13) : (-17+7)\), we first compute the values inside the parentheses.

1. Calculate \(3 - 13\): \[ 3 - 13 = -10 \]

2. Calculate \(-17 + 7\): \[ -17 + 7 = -10 \]

Now we can substitute these results back into the expression: \[ (-10) : (-10) \]

The division of \(-10\) by \(-10\): \[ \frac{-10}{-10} = 1 \]

So, the final result is: \[ \boxed{1} \]