Bài 2: Tìm x, biết:
a) (2x + 7)(5x + 6) – (x + 1)(10x + 17) = (x + 2) – (x – 7)
b) 4(x + 5)(2x – 3) – 8(x – 1)(x + 4) = 0
c) (x + 3)(x – 7) + (5 – x)(x + 4) = 10
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