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12x + 8 + 4x + 20 + 8x -16 = 156
24x + 12 = 156
24x = 144
X = 6
b panjang balok 3x+2 = 3.6 + 2 = 20
lebar balok x+5 = 6+5 = 11
tinggi 2x-4 = 2.6-4 = 8
c v= plt = 20.11.8 = 1760