3. \( -6+(7-(-5)+(-19)) \)

Let’s break this expression down step by step! First, simplify the parentheses: \( 7 - (-5) \) becomes \( 7 + 5 \), which equals \( 12 \). Now we have \( -6 + (12 - 19) \). Simplifying \( 12 - 19 \) gives us \( -7 \). Finally, we combine \( -6 + (-7) = -13 \). So, the final answer is \( -13 \)! To check this, you can start from the end and work backward. Consider substituting the final result back into the original equation to verify all steps match up. It’s also another fun exercise in ensuring every sign is right – you'll see it's all about practice; the more you do, the better you’ll get!