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The area of a rectangle is calculated by multiplying the length by the width. In this case, the area is 64 square centimeters and the width is 4 centimeters.
Let the length of the rectangle be x centimeters.
So the equation to find the length would be:
x * 4 = 64
Solving for x:
x = 64 / 4
x = 16
Therefore, the length of the rectangle is 16 centimeters.