Помогите с алгеброй Решить уравнение:
1)4х^2-28 =0;
2)7x^2+9x =0;
З)х^2+5х-36=0;
4)3х^2-28х+9 =0;
5)2х^2-8х+15 =0;
6)25x^2-10x+1 = O.
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