Respuesta :

B. x^2 - 6x -7 = 2x

Or, x^2-6x-2x-7=0

Or, x^2-8x-7=0

Or, x^2-x-7x-7=0

Or, x(x-1)-7(x-1)=0

Or, (x-1)(x-7)=0

x=1, x=7.