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112 = 2(3x + -4 + 2x + 5)
112 = 2(5x + 1)
112 = 10x + 2
112-2 = 10x
110 = 10x
11 = x
p = 3x - 4 = 3(11) - 4 = 33 - 4 = 29 cm
l = 2x + 5 = 2(11) + 5 = 22 + 5 = 27 cm