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120 = 4 ( 2x + 3x + 5x)
120 = 4 ( 10x)
120 = 40 x
x = 3
p = 2x =6
l = 3x = 9
t = 5x = 15
luas permukaan = 2 ( pxl + pxt + lxt)
= 2 (54 + 90 + 135)
= 558