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l = x + 5
t = 2x - 4
Rusuk = 4(p + l + t)
156 = 4(3x + 2 + x + 5 + 2x - 4)
39 = 3x + 2 + x + 5 + 2x - 4
39 = 6x + 3
39 - 3 = 6x
36 = 6x
6 = x
156/4 = 6x+3
39 = 6x+3
36 = 6x
x = 36/6
x = 6