write an equivalent expression by distributing the "-" sign outside the parentheses

To distribute the "-" sign outside the parentheses, you multiply each term inside the parentheses by -1. Here's how it's done:

\[ -(-6d - 6.7f + 0.6) = 6d + 6.7f - 0.6 \]

So, the equivalent expression is:

\[ 6d + 6.7f - 0.6 \]