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Math Help - simple transpose problem but not sure of answer

  1. #1
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    simple transpose problem but not sure of answer

    Hi All;
    qx / ta = T2 - T1 make T2 the subject.

    My question is when I add T1 to both sides why does it move as +T1
    and not T1/1?
    Thanks.
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  2. #2
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    Because the opposite of subtracting a number is adding a number...

    Oh, well you COULD do it as T1/1, since it's the same as T1, but you don't need to. It would really only come in handy if you plan to create a common denominator...
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  3. #3
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    Ok thanks.
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  4. #4
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    Prove it can you give me an example of where I would need a common denominator.

    Thanks.
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  5. #5
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    Sure can...

    Try to solve for u:

    1/u + 1/v = 1/f
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