Помогите решить уравнения!(где x2 - квадрат икс)

1) x2 + 3x + 70 = 0

2) x2 - 12x + 11 = 0

3) x2 + 20x + 100 = 0

4) x2 + 18x - 208 = 0

5)x(x-15)=3(108-5x)

6)(x-3)2 + (x+4)2-(x-5)2=17x+24

7)5x2+9       4x2-9
________ - ________ = 3
      6              5
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