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Verified answer
P = 2x+1l = x+5
t = x
panjang rusuk balok = 4(p+l+t)
104 = 4( 2x+1 +x+5 +x )
104 = 4(2x+x+x+1+5)
104 = 4(4x+6)
104 = 16x+24
104 - 24 = 16x
80 = 16x
x = 80/16
x = 5
panjang = 2x+1 = (2×5)+1 = 11cm
lebar = x+5 = 5+5 = 10cm
tinggi = x = 5cm
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