the answer to Q.a is the easiest, since it just involves shifting the three expressions around
Q.b is slightly more complex since it involves balancing the equation by doing some arithmetic
- remember that what you do to one side of the equation, you must also do to the other..
so - for example, taking 2 from the right side means that you also have to do the same to the left..
you are not being asked to simplify the equations - just to rearrange them..