The equation is written as
3/5f + 24 = 4 - 1/5f
You start with the first step in algebra which is to collect "like terms." Like terms refer to expressions that have the same characters. So the values that includes the unknown (which is the letter f in this case) would be group together on one side and those that dont have an f would be grouped on the other side. Hence we now have;
3/5f + 1/5f = 4 - 24
Note that when a number crosses from one side of the equation to the other side, a positive changes to a negative, and vice versa. Therefore, -1/5f has now become +1/5f on the left side, while +24 has become -24 on the right side.
3/5f +1/5f = 4 - 24
Since both expressions have the same denominator The left hand side of the equation
