Three adult and three child movie tickets were purchased for $75. The cost of each child ticket is $3 less than the cost of an adult ticket. Identify the first step if solving this problem arithmetically, which would find the cost of one adult and one child ticket. (1 point)

Divide 75 by 6.

Add 3 to 75.

Subtract 6 from 75.

Divide 75 by 3.