a)2x-3=2x+5x2-xb)12x-2-2x+1x2+x+1+32x+2=0c)12x+16x+2-9x+53x+1=108x-36x2-94(9x2-1)d)x+4x2-3x+2+x+1x2+4x+3=2x+5x2-4x+3
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