13. 15. Решите уравнение: 1)(х + 10)(x-9) - (x - 8)² = 0
2)(х + 11)(x+ 9)-(x -3)(x+40)=0
3) (x-6)(7+x)+(3-x)(3+x)=0
4) (х-4)(4 + х)-(1 -x)(9-x)= 0

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