tell me what you see give me the answer .

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tell me what you see give me the answer .
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tell me what you see give me the answer .
tell me what you see give me the answer .
 

tell me what you see give me the answer .
12/7x+9/7x=21/7x=3x
I think that you could understand this clearly,the both fractions have the common denominator,the addtion of the two numerators is 21.21/7x=3x.

3x

X÷3

=21/7✘=3/✘