Mistake in the solution
Look at this question: The solution is incorrect because it does not consider x=10, which makes the LHS equal to RHS. Which means that x = (0,19)-{10}. Therefore there are actually 19 values of x, Not 20
Look at this question: The solution is incorrect because it does not consider x=10, which makes the LHS equal to RHS. Which means that x = (0,19)-{10}. Therefore there are actually 19 values of x, Not 20