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5x + 8 = 2x + 7

5x - 2x = -8 + 7

3x = -1

x = -1/3

(5 x -1/3 + 8 = 6 1/3; 2 x -1/3 + 7 = 6 1/3; QED)

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Q: 5x plus 8 is congruent to 2x plus 7?
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