приведите уравнение к виду ах^+2bx+c=0

с решением:

1) x(3x+5)-1=x(x-4)=

2) (7x-1)(2+x)=(x-4)(x+4)=

3) (6+x)^2= (x-2)(3-x)=

4) x(8-3x)= (5x-1)^2=

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