Помогите пожалуйста! СРОЧНО!!! Решите уравнения
а) (3x+1)(1-3x)+6x(1,5x+2)=19
б) (7x-5)(7x+5)-24x²=0
в) 5(x-4)(x+4)-x(5x+7)=-143
г) (x-3)(x+3)(x²+9)=-65
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