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400cm = 2 × (5x + 10 + 80cm)
400 = 10x + 20cm + 160cm
400 = 10x + 180cm
400cm - 180cm = 10x
220cm = 10x
x = 220cm ÷ 10
x = 22cm
400 = 2 ( 5x + 10 ) + 2 ( 80 )
400 = 10x + 20 + 160
10x = 400 - ( 20 + 160 ) = 220
x = 240/10 = 22