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L= 16x+20-2.5(x+3)/2
L=16x-10x+20-30/2
L=6x-10/2
L=3x-10
K = 2 (p+l)
16x + 20 = 2 (5x + 15 ) + 2l
16x + 20 = 10x + 30 + 2l
2l = (16x + 20) - ( 10x - 30)
21 = 6x - 10
l = (3x - 5) cm
maka lebar persegi panjang (3x - 5) cm