Тема :неравенство.Систама неравенств. Помогите пожалуйста

1) 2(-2-x)<либо=-6
2)5-8(-1+x)<либо=-5x-8
3)x^2>либо=49
4)x^2-7x>либо=0
5)(x-4)(x+2)>либо=0
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