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panjang = 5x ------ 5(4) = 20 cm
lebar = 3 x -------- 3(4) = 12 cm
keliling = 2(p+l)
64 = 2 ( 5x + 3x )
64 = 2 ( 8x )
64 = 16x
x = 64 / 16
x = 4
maka panjang 20 cm dan lebar 12 cm