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27 December, 17:57

1/12x-1/12=1/8x+1/6-1/6x

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Answers (2)
  1. 27 December, 20:23
    0
    So multiply both sides by 24 (Least Common Multiply of 12, 8, 6)

    2x - 24 = 3x + 4 - 4x

    2x = 28 - x

    3x = 28

    x = 9.33
  2. 27 December, 20:52
    0
    Solve for x:

    x/12 - 1/12 = x/8 - x/6 + 1/6

    x/12 - 1/12 = (x - 1) / 12:

    (x - 1) / 12 = x/8 - x/6 + 1/6

    Put each term in x/8 - x/6 + 1/6 over the common denominator 24: x/8 - x/6 + 1/6 = (3 x) / 24 - (4 x) / 24 + 4/24:

    (x - 1) / 12 = (3 x) / 24 - (4 x) / 24 + 4/24

    (3 x) / 24 - (4 x) / 24 + 4/24 = (3 x - 4 x + 4) / 24:

    (x - 1) / 12 = (3 x - 4 x + 4) / 24

    Grouping like terms, 3 x - 4 x + 4 = 4 + (3 x - 4 x):

    (x - 1) / 12 = (4 + (3 x - 4 x)) / 24

    3 x - 4 x = - x:

    (x - 1) / 12 = (-x + 4) / 24

    Multiply both sides by 24:

    (24 (x - 1)) / 12 = (24 (4 - x)) / 24

    24/12 = (12*2) / 12 = 2:

    2 (x - 1) = (24 (4 - x)) / 24

    (24 (4 - x)) / 24 = 24/24 * (4 - x) = 4 - x:

    2 (x - 1) = 4 - x

    Expand out terms of the left hand side:

    2 x - 2 = 4 - x

    Add x to both sides:

    2 x + x - 2 = (x - x) + 4

    x - x = 0:

    2 x + x - 2 = 4

    2 x + x = 3 x:

    3 x - 2 = 4

    Add 2 to both sides:

    3 x + (2 - 2) = 2 + 4

    2 - 2 = 0:

    3 x = 4 + 2

    4 + 2 = 6:

    3 x = 6

    Divide both sides of 3 x = 6 by 3:

    (3 x) / 3 = 6/3

    3/3 = 1:

    x = 6/3

    The gcd of 6 and 3 is 3, so 6/3 = (3*2) / (3*1) = 3/3*2 = 2:

    Answer: x = 2
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