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Did you do it this way?
Set up two equations:
L = Length
W = Width
2L + 2W = 206
L = W + 29
Solve for W
2(W + 29) + 2W = 206
2W + 58 + 2W = 206
4W + 58 = 206
4W + 58 - 58 = 206 - 58
4W = 148
4W/4 = 148/4
W = 37
Solve for L. Use either equation
L = W + 29
L = 37 + 29
L = 66
L = 66
W = 37
P = 66*2 + 37*2 = 206