-3,8k-k+3,8k+k

Let's simplify the expression \(-3.8k - k + 3.8k + k\).

1. Combine like terms: \(-3.8k - k + 3.8k + k\)

   Group the \(k\) terms: \((-3.8k + 3.8k) + (-k + k)\)

2. Simplify each group: \(-3.8k + 3.8k = 0\) \(-k + k = 0\)

So, the entire expression simplifies to:

\[ 0 + 0 = 0 \]

Therefore, the simplified expression is \(0\).