The original price is $200 because if you did 200 * 0.2, it would equal $160 which is the discounted price.
Begin solving like you normally would. Add 2.25 to both sides and subtract 9x from both sides to try getting all x values on one side. However, you will find that after subtracting 9x from both sides, all x values go away, and you end with -2.25=1.6. This is not true (-2.25 is not 1.6), so the answer is no solution. There is no value of x which satisfies that equation.
Simplest form of:
12/30=2/5
12/20=3/5
21/35=3/5
