Решите пожалуйста!   10x^2+7x+1=0 12x^2+13x-4=0 3x^2+2x-1=0 4x^2-19x-5=0 6x^2+13x-5=0 3x^2+x-1=o 8x^2+x+1=0 x^2+x-6=0 x^2-3x-18=0
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