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b) x3+x2+x-x2-x-1=x3-1
c) x7-x3+x2-x5+x-1=x7-x5-x3+x2+x-1
d) 5x2-5-3x3+3x+x4-x2=4x2-5-3x3+3x+x4=x4-3x3+4x2+3x-5