Пожалуйста ,помогите .срочно надо
1)5(x+2)-6x=7x
2)(x-5)(x-7)=0
3)6x²+5x+1=0
4)20x²+11x+1=0
5)-7x+(x-1)5+2x-5=7x
6)x²+5x+6=0
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