Let's solve the expression step by step:
The given expression is:
\[ 15 \times 8^0 / 5 + 4 \times (7^0 - 6) \]
Step 1: Calculate \(8^0\) and \(7^0\).
By definition, any non-zero number raised to the power of 0 is 1.
\[ 8^0 = 1 \quad \text{and} \quad 7^0 = 1 \]
Step 2: Substitute these values back into the expression.
\[ 15 \times 1 / 5 + 4 \times (1 - 6) \]
Now the expression simplifies to:
\[ 15 / 5 + 4 \times (-5) \]
Step 3: Divide \(15\) by \(5\).
\[ 3 + 4 \times (-5) \]
Step 4: Calculate \(4 \times (-5)\).
\[ 4 \times (-5) = -20 \]
Step 5: Substitute back into the expression.
\[ 3 - 20 \]
Step 6: Finally, calculate \(3 - 20\).
\[ 3 - 20 = -17 \]
Thus, the final result of the expression is:
\[ \boxed{-17} \]