Question

9x - 42 = 21

Explanation:

Step1: Add 42 to both sides

To isolate the term with \( x \), we add 42 to both sides of the equation \( 9x - 42 = 21 \). This gives us \( 9x - 42 + 42 = 21 + 42 \), which simplifies to \( 9x = 63 \).

Step2: Divide by 9

Now, we divide both sides of the equation \( 9x = 63 \) by 9 to solve for \( x \). So, \( \frac{9x}{9} = \frac{63}{9} \), which simplifies to \( x = 7 \).

Answer:

\( x = 7 \)