Answer:
It depends on your career but the important types are counting, addition, subtraction, multiplication and division.
It depends on what the question is
First distribute 3 to (x-4). that gives you 3x-12. Now your equation is x-2=3x-12. Now you subtract x from 3x. now you're equation is -2=2x-12. then add 12 to the left. You're final answer is 10.
1. Convert percent into decimal (it will help)

2. Convert Decimal to fraction