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42 ; 2((3x+1)+(2x-5))
42 ; 2(3x+1+2x-5) ; 2(5x-4)
42 ; 10x-8
42+8 ; 10x
X ; 5
P ; 3x+1 ; 3.5+1 ; 16
L ; 2x-5 ; 2.5-5 ; 5
42=2((3x+1)+(2x-5))
42=10x-8
50=10x
x=5
P= 3×5+1=16 cm
L=2×5-5=5 cm