Two of the sides can be represented by x, and the two other sides can be represented by x+15.
x + x + (x +15) + (x + 15) = 130
OR
2x + 2x + 30 = 130
4x + 30 = 130
subtract 30 for each side
4x = 100
divided 4 for each side
x = 25
25 + 25 + 40 + 40 = 130 meter perimeter