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how do you simplify 3/7 - 4/m

Mathematics
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\[\huge \frac 3{7 - \frac 4m}\] ???
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\[A. \frac{ 3m-28 }{ 7m } B. -\frac{ 1 }{ 7m} C. -\frac{ 25 }{7m} D. -\frac{ 25 }{ 7}\]

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Other answers:

how do i simiplify it though?
multiply not multiplay lol
You must get a common denominator.. My sugestion multiplay the left side by m/m and the right side by 7/7 then you can just subtract the numerators
Answer A is the answer to the question as reiterated by Abirla above. We get it in the following manner\[\frac{3}{7}-\frac{4}{m}=\frac{3}{7}\frac{m}{m}-\frac{4}{m}\frac{7}{7}=\frac{3m}{7m}-\frac{28}{7m}=\frac{3m-28}{7m}\]
The answer is (a). You need to find a common denominator. Multiply (3/7) by m/m which is essentially 1. Also multiply 4/m by 7/7. Now you can do the subtraction to get (a)
As Chyme said just above, multiply each term by one in a form that will give a common denominator (in this case, 7m).
exact what i was thinking' the denominator is 7m
Ha, I like multiplay better than multiply

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