To solve the equations, we will solve each equation separately.
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Solve the first equation: \(-3x + 7 = 10\)
Subtract 7 from both sides: \(-3x = 10 - 7\) \(-3x = 3\)
Now, divide both sides by -3: \(x = \frac{3}{-3}\) \(x = -1\)
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Solve the second equation: \(3x - 9 = 0\)
Add 9 to both sides: \(3x = 9\)
Now, divide both sides by 3: \(x = \frac{9}{3}\) \(x = 3\)
Now we combine the solutions from both equations: The solution set is \({-1, 3}\).
Thus, the correct response is: \({-1, 3}\)