Three adults and three child movie tickets are purchased for $75. The cost of each child to get is three dollars less than the cost of an adult ticket. Identify the first step of solving this problem a risk medically, which would find the cost of one adult and one child to get.

The first step to solving this problem would be to let x represent the cost of an adult ticket. Then, the cost of a child ticket would be x - 3 since it is three dollars less than the cost of an adult ticket.