9
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123456789+987654321+123456789+987654321=100
9+8+7+65+4+3+2+1 = 99. So 7 addition signs need to go in 987654321 to get a total of 99.
2 sixths are equal to 1 third
NOPE if you take 2 from each, they shoud be equal, but 3/7 does not equal 1/4
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