The circumference of a rectangle is 40cm. If the width is 6cm and the length is xcm, the equation ()

The circumference of a rectangle is 40cm. If the width is 6cm and the length is xcm, the equation ()

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It is known that the width of a rectangle is (2a-b) cm, and the length is (a-b) cm more than the width

The circumference of the rectangle is 40cm, and the length is 3cm more than the width. Find out the length and width respectively. Let X be the unknown number and list the equation
Let the width be X

Let the width be X
x+3+x=40÷2
2x=20-3
2x=17
X = 8.5 = width
Length = 20-8.5 = 11.5