X/5 = 7; 35 points (just adding more words so i can submit this)
10x - 12 + 10 = 18 - 20
10x - 2 = -2
10x = 0
x = 0
A) length= w+5
width=w
perimeter=42mm
B) 2(w+5)+2w>42
2w+10+2w>42
4w>32
w>8
The width should be greater than 8 and the length should be more than 13.
Hope this helps!