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x = p - 3
K = 2(p + l)
90 = 2(p + (p - 3))
90 = 2(p + p - 3)
90 = 2(2p - 3)
90 = 4p - 6
96 = 4p
p = 24
x = p - 3
x = 24 - 3
x = 21