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Solve for x: |(3x + 4)/3| = 7.

1. x = 17/3 or x = -25/3
2. x = 7/3 or x = -7/3
3. x = 17/3 only
4. x = 25/3 or x = -17/3

Correct answer: x = 17/3 or x = -25/3

Solution

The modulus equation gives two linear equations; solve each for x.

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