Ответ:
1. 4 × 2x + 5 + 7 = 8x + (5 + 7) = 8x + 12
6x - 4x + 9 = 2x + 9
6 × 3u + b - 2 × u + 3b = 18u + b - 2u + 3b
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Ответ:
1. 4 × 2x + 5 + 7 = 8x + (5 + 7) = 8x + 12
6x - 4x + 9 = 2x + 9
6 × 3u + b - 2 × u + 3b = 18u + b - 2u + 3b