2x Times X. In contrast 2x means x is multiplied by 2. By rules of exponents we add the exponents of like terms.

Its just 2 times x - 1 times x although usually you dont write 1 in front of x because its unnecessary but Ill write it for the sake of your understanding. The derivative of a x n is n a x. 2xx 2x 2.
2x X 6x 12x 2.
Recall that an exponent tells us how many times a value is multiplied by itself. Location - TWO TIMES and TIMES TWO - always MIDDLE LEFT. 2xx 2x 2. 12x X 2x.