Помогите надо срочно!!! 1)(3х-9)-(3х+3)=0 добавь квадраты и реши уравнения
2)(3х +2) -(3х+5)(3х-5)=23
3)(х-2)(х+2)-х(х-3)=0
4)(х+4)(1-х)-3=(х+1)(4-х)
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