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3/8x²-3/16x-x+1/2=3/8x²-19/16x+1/2
1/5x²+0,3x-3/16x+3/16=1/5x²+9/8x+3/16
6/15x²-4/9x-3/10x+2/6=6/15x²-58/90x+1/3