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x²-2x+1-(x²+8x+16)+2x+31=0
x²-2x+1-x²-8x-16+2x+31=0
-8x+16=0
16=8x
x=2
x² - 2x + 1 -( x² + 8x + 16) +2x + 31 = 0
-2x +1 - 8x - 16 + 2x +31 =0
-8x = -16
x = 2