1_
[tex]4n + (3n + 1) \\ = 4n + 3n + 1 \\ = 7n + 1[/tex]
2_[tex]13k - (2k + 4) \times 10 \\ = 13k - (20k + 40) \\ = 13k - 20k - 40 \\ = - 7k - 40[/tex]
3_
[tex]17 - 2 \times ( - 5 - x) \\ = 17 + 10 + 2x \\ = 27 + 2x[/tex]
