I want to say 7.6% is the answer
The sum(9) of half of the first number(1/2a) and one third of the second number(+1/3b)
That is correct
Step Number 1. is to Simplify

Step Number 2. <span>Simplify so you get </span>

Done! :)
(2x-6) + 4(x-3) {distribute 4 out and expand problem}
2x+6+4x-12 {combine like terms}
6x-6 {your answer}