Let's solve the expression step by step.
Given:
\[ 15 \cdot 8^0 / 5 + 4(7^0 - 6) \]
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Calculate \( 8^0 \): \[ 8^0 = 1 \]
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Substitute into the expression: \[ 15 \cdot 1 / 5 + 4(7^0 - 6) \]
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Now calculate \( 15 \cdot 1 / 5 \): \[ 15 / 5 = 3 \]
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Next, calculate \( 7^0 \): \[ 7^0 = 1 \]
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Substitute into the expression: \[ 4(1 - 6) \]
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Calculate \( 1 - 6 \): \[ 1 - 6 = -5 \]
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Now multiply: \[ 4 \cdot (-5) = -20 \]
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Now put everything together: \[ 3 + (-20) = 3 - 20 = -17 \]
Therefore, the final answer is:
\[ \boxed{-17} \]