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64=2(2x+3+x+8)
32=(3x+11)
21=3x
x=7
l=x+8=7+8=15 cm
Semoga membantu
64 = 2 ((2x + 3) + (x + 8))
64 = 2 (3x + 11)
64 = 6x + 22
42 = 6x
x = 7
Lebar = x + 8
= 7 + 8
= 15