Explanation:
false.
3x + 6x is equivalent to 9x
but not 3x + 6. 6 is a constant added term. not a multiplication factor. so, it cannot be combined with a multiplication factor.
but 3x + 6 = 9x
has one solution, one value of x for which this equation is true :
3x + 6 = 9x
6 = 6x
x = 1
so, for x = 1 (and only for x = 1) this is true. for any other value of x this is false.
therefore, the general equivalent statement is false.