Answer
False
The true statement would read:
If $7x = 21$, then $x = 21 \div 7$.
Work Step by Step
This statement is false.
To solve for $x$, we divide each side by $7$ to get:
$x = 21 \div 7$
The statement should actually say:
If $7x = 21$, then $x = 21 \div 7$.