(3,8*2,5-7):(-5)

Let's solve the expression step by step.

First, evaluate the expression in parentheses:

1. Calculate \(8 \times 2.5\): \[ 8 \times 2.5 = 20 \]

2. Now compute \(20 - 7\): \[ 20 - 7 = 13 \]

So the expression in the parentheses becomes \(3, 13\).

Now, let's rewrite the expression: \[ (3, 13):(-5) \] This notation seems to be unusual, but if we consider it in a typical numeric format, we can interpret it as dividing the value from the parentheses by -5.

Next, we calculate: \[ \frac{13}{-5} = -2.6 \]

Thus, the final result is: \[ -2.6 \]