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how do you figure out the fraction a+1/6=3/5

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    a+1/6=3/5
    subtract 1/6 on each side:
    a+(1/6)-(1/6)=(3/5)-(1/6)
    a=(3/5)-(1/6)
    The common denominator is 30, so
    a=(3*6/30 - 1*5/30)
    =(18-5)/30
    =13/30

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