Here’s a step by step so you know for next time!
To easily find it you would simply switch around the equation, so instead of doing x-12.06=-9.4 just do -9.4+12.06 (the opposite of subtracting) which equals 2.66. And just to make sure I was correct I plugged it in, and the equation 2.66-12.06=-9.4 is correct.
Answer: x= 2.66