Part A: Maria's solution is incorrect. This is because to find x, we want to just have one x on the left side instead of six, so we divide the equation by six, not subtract it.
The correct steps:
1) 6x = 48
2) 6x/6 = 48/6
3) x = 8
Part B: This equation will only have 1 solution, as the only way to solve this is divide 6 from 48