x(x-8)+(x+8)(x+8)-(x2+x+72)/(x-8)(x+8)=0
x2+7x-8/(x-8)(x+8)=0
x2+7x-8=0
(x-8)(x+8)=0
D= 49-4×1×(-8)=81
x1= -7+9/2=1
x2= -7-9/2= -8
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x(x-8)+(x+8)(x+8)-(x2+x+72)/(x-8)(x+8)=0
x2+7x-8/(x-8)(x+8)=0
x2+7x-8=0
(x-8)(x+8)=0
D= 49-4×1×(-8)=81
x1= -7+9/2=1
x2= -7-9/2= -8