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To find the solution set, we need to solve each equation separately and then combine the solutions.
For the first equation, -3x + 7 = 10:
Subtracting 7 from both sides, we have -3x = 3.
Dividing both sides by -3, we get x = -1.
For the second equation, 3x - 9 = 0:
Adding 9 to both sides, we have 3x = 9.
Dividing both sides by 3, we get x = 3.
Therefore, the solution set is { -1, 3 }, so the answer is (d).