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2×(p+l) = 144
5x-2+2x+4 = 144:2
7x+2 = 72
7x = 72-2
7x = 70
x = 70:7
x = 10
p = 5x-2
p = 5×10-2
p = 50-2
p = 48 cm
l = 2x+4
l = 2×10+4
l = 20+4
l = 24 cm