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42 = 2(4y+3y)
42 = 2(7y)
42 = 14y
42 : 14 = y
3 = y
panjang = 4y = 4 x 3 = 12 cm
lebar = 3y = 3 x 3 = 9 cm
luas = p x l
luas = 12 cm x 9 cm
luas = 108 cm²