32.27. 1) (7 - 8x)(2x + 1) + (4x - 1)2 = 0; 2) (2x - 5)2 - (2x - 3)(2x + 3) = 15; 3) (3x + 5)(3x - 5) -(3x - 1)2 = -4; 4) (9x + 2)(1 - 4x ) + (5 - 6x)2 = -32. ​
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