Yes. If the side lengths are different, you can end up with different angle measurements (example: SSA~ property. You can have two sides that are the same but you can make two different triangles with those side lengths and that one angle.)
1-(1/5)= 4/5 or 28/35 if you multiply top and bottom by 5
7x + 15 = 38
7x = 38 - 15
7x = 23
x = 23/7 (twenty- three sevenths)
Question 2: peaceful protests without violence
5x+y=-3 is the standard form