math

how do you solve these problems?

1.2x/3 + 1/3 - x/8= 2/3



2. 3n + 9/10 + n/5= -2 3/10


3. 3k/4 - 28 - 2k/3 = 37

thank you can you please show me step by step how you got the answer?

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asked by Sara!
  1. I will do one for you, and you try the other two

    2.
    3n + 9/10 + n/5= -2 3/10
    3n + 9/10 + n/5= -23/10
    looks like 10 is the lowest common denominator, so multiply each term by 10

    30n + 9 + 2n = -23
    32n = - 23 - 9
    32n = - 32
    n = -1

    hint: for the first, multiply each term by 24
    for the third, multiply each term by 12

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    posted by Reiny
  2. i got for # 3 8/13 and plugged in the number for the letters and got it wrong. what is the correct way to solve it thank you

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    posted by Sara!
  3. #3
    3k/4 - 28 - 2k/3 = 37
    times 12
    9k - 336 - 8k = 444
    k = 444+336
    k = 780

    check:
    Left side = 3(780)/4 - 28 - 2(780)/3
    = 585 - 28 - 520
    = 37
    = right side

    My answer is correct, how did you get 8/13 ?

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    posted by Reiny

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