Verified Answer :

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.