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4x²+28x+54=4x²-2
4x²+28x-4x²=-2-54
28x=-56/28
x=-2
-(x²-8x+16)=9-x²
-x²+8x-16=9-x²
-x²+8x+x²=9+16
8x=25/8
x=3 1/8