Solve for $x$ in the simplest manner (no calculator or Quadratic Formula). 

1. $5x^2=15x$

   Hint (a):

   1. Move all variables to one side equal to $0$.
   2. Factor.
   3. Find the values of $x$ making the equation true.

2. $2(x-6)^2+5=23$

   Hint (b):

   1. Subtract $5$ from both sides.
   2. Then divide both sides by $2$.
   3. Take the square root of both sides.
   4. Be careful with the signs!
   5. Solve for values of $x$.