The perimeter of the triangular park is 16x-4. What is the missing length? (Simply the answer)

Answer:
9x-5
Step-by-step explanation:
5x+2x=7x -3+4-1
7x+1
16x-7x=9x
4-3-5=-4
2x+5x+9x=16x
16x-4
If I got it right branliest would be nice!!
Answer:
9x - 5
Step-by-step explanation:
Let the missing length is a
We have:
a + (5x-3) + (2x+4) = 16x - 4
=> a = (16x - 4) - (5x-3) - (2x+4)
a = 16x - 4 - 5x + 3 - 2x - 4
a = (16x - 5x - 2x) - ( 4 - 3 + 4)
a = 9x - 5