Find the value of x: 6x + 9 = 3x + 0

Okay, let's solve this equation step-by-step!

1. Goal: We want to get all the 'x' terms on one side of the equation and the numbers on the other.
2. Move x terms: Subtract 3x from both sides:

   6x - 3x + 9 = 3x - 3x + 0

   3x + 9 = 0

3. Move number terms: Subtract 9 from both sides:

   3x + 9 - 9 = 0 - 9

   3x = -9

4. Isolate x: Divide both sides by 3:

   3x / 3 = -9 / 3

   x = -3

Ответ: x = -3