O, I see you multiply both sides by 100. I was multiplying 0.05 by 100 and the right side of the equation 0.3 by 10 So im assuming you must keep the continuity by multplying both sides by 100.
Yes, whenever you do something to the left side of an equation, you must do the same thing to the other side.
But be careful, that wasn't your only problem- when you multiply the left side by 100, you multiply the entire left side- and you didn't do that before. 100(.05x- 2)= 100(.05x)- 100(2)= 5x- 200. That is why earboth has "200" where you had only "2".