Given situations:
Let my number be X
=> Triple my number = 3x
=> add six = + 6
=> subtract twice my number = -2x
=> my number plus 3 = x + 3
now, that we simplify each given word phrase, we will now create our equation.
=> 3x + 6 – 2x = x + 3
=> 3x – 2x = x + 3 – 6
=> x = x – 3
=> x – x = -3
Where x will be cancelled out, thus, this statement is not valid.