If \( x+\frac{2}{7} x=9 \), then \( x= \)
\( x = 7 \)
Step 1 :\( x + \frac{2}{7}x = 9 \)
Step 2 :\( x\left(1 + \frac{2}{7}\right) = 9 \)
Step 3 :\( x = \frac{9}{\frac{9}{7}} \)
Step 4 :\( x = \frac{63}{9} \)
Step 5 :\( x = 7 \)