math

3/7x+5=8.
I tried to cross-mulitplied and I got 3x+35=8. I divided -27 by 3 and I got -9. Is this right?

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asked by david
  1. 3/7x+5=8.
    I tried to cross-mulitplied and I got 3x+35=8. I divided -27 by 3 and I got -9. Is this right?

    Not quite.

    Given 3/7x + 5 = 8
    Multiply through by 7x yields
    3 + 35x = 56x
    3 = 21x making x = 1/7.

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    posted by tchrwill

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