3.Решите уравнение:

1)(7x+1)(x-3)+20(x-1)(x+1)=3(3x-2)²+13

2)(3x+5)²-64=0

3)(3z+5)²-(4z-7)²=0

4)(x+4)²+(x-8)²=2(8-x)(x+4)
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