4x - (-2x) = -2x - 2
-x - 14 = x - 14

5 · (x - 24) · 15 = 0

3 · (x - 3) - 4 · (4 - x) = 3

2 · (x + 1) + 5x = 23

2 · (x -1) - x + 3 = 2x

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