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x²+8x+16=10x²-2x-7x+14
x²+8x+16=10x²-9x+14
x²+8x+16-10x²+9x-14=0
-9x²+17x+2=0
-(x-2)(9x+1)=0 multiplicamos por -1
(x-2)(9x+1)
(x-2)=0 ......x-2=0..................x=2
(9x+1)=0...9x+1=0....9x=-1....x=-1/9