pinkblossom
add and simplify 7/9 + 1/6



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roselin
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use the same cross multiplication method here

redshift
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The reason you do that is it makes the denominator the same.
The denominators must be the same in order to perform addition or subtraction.

pinkblossom
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okay

roselin
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dw:1354849773533:dw

pinkblossom
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33/54

roselin
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yes,that is correct