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panjang = 2x + 1
keliling = 2(p+l)
44 = 2 (2x + 1 + x)
44 = 2 (3x + 1)
44 = 6x + 2
44 - 2 = 6x + 2 - 2
42 = 6x
x = 42/6 = 7
panjang = 2x + 1 = 2 x 7 + 1 =14 + 1 = 15 cm
lebar = x = 7 cm