Question

Solve by factoring.......................

Answer 1

$7x^2=21x\\ 7x^2-21x=0\\ 7x(x-3)=0\\ x=0 \vee x=3$

Answer 2

$7x^2=21x \\ 7x^2-21x=0 \\ 7x(x-3)=0 \\ 7x=0 \ \lor \ x-3=0 \\ x=0 \ \lor \ x=3 \\ \boxed{x=0 \hbox{ or } x=3}$