To simplify \((-8 - 7i) + (7 + 6i)\), you need to combine the real parts and the imaginary parts separately.
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Combine the real parts: \(-8 + 7 = -1\)
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Combine the imaginary parts: \(-7i + 6i = -1i\) or simply \(-i\)
Putting it all together, the simplified expression is: \[ -1 - i \]