[-2/7]x[-4/9]+[-3/5]x[-4/9]
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[ − 2 7 ] [ − 4 9 ] + [ − 3 5 ] [ − 4 9 ]
− 2 7 ( − 4 9 ) + [ − 3 5 ] [ − 4 9 ]
−72(−94)+[5−3][9−4] 8 6 3 + [ − 3 5 ] [ − 4 9 ]
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