Let's try to understand how we can solve this equation
Given equation,4f+2=6f-12
Now we will take the terms on one side and constants on the other.
=> 2+12=6f-4f
=> 14=2f
=>7=f
So, the value of f would be 7. Remember that while bringing value to another side, the sign of that value changes. If it is a positive sign then it is going to be transformed into a negative one and vice versa.