Corretto: 3a+5a-7a=a, 2a*a=2a2, 3x:x=3, 2ab:b=2a, 4a-2a=2a, (3x2  + 2x2 ) - (5x2 )=0, 3ab*2a=6a2b, Errato: 3a+5a-7a = -a, 2a*a=3a, 3x:x=x, 2ab:b=2b, 4a-2a=a, (3x2 + 2x2 ) - (5x2)=10x2, 3ab*2a=9ab,

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