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The area \( A \) of a rectangle is calculated using the formula:
\[
A = \text{length} \times \text{width}
\]
In this case, the length is \( x \) cm and the width is \( 7 \) cm. According to your question, the area is given as \( 56 \) cm². We can set up the equation:
\[
A = x \times 7 = 56
\]
To find the value of \( x \), we can rearrange the equation:
\[
x \times 7 = 56
\]
Now, divide both sides by \( 7 \):
\[
x = \frac{56}{7}
\]
\[
x = 8
\]
So, the length of the rectangle is \( 8 \) cm.