Answer:
The equation is 5x = 30
Part A
Charlies solution is incorrect
Step 2 is incorrect, 5 should not be subtracted
You should divide by 5 on both sides, leaving x on the left hand side and 30/5 on the right hand side
The correct steps are,
Step 1: 5x = 30
Step 2: x = 30/5
Step 3: x = 6
Part B
We see from part A, Step 3 (x=6) that the equation has 1 solution.
The equation will have 1 solution