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It's 9 if you do it correctly.
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You cant do it correctly without a horizontal division line as this equation can be either [u]6[/u] or. [u]6[/u] (2+1) 2 (1+2) 2. Without horizontal division lines they are both correct
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That is a bad example 6 or. 6 ------------ --- (1+2) 2 (1+2) 2
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That's what the equation means both at the same time are correct. Read the article