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? asked in Science & MathematicsMathematics · 8 years ago

Help me with these one variable equations please ?

1. 4=2/5g

2. 3(2x-5)-x=-7(x+3)

3. 1/5d+1/8d=2

4. 3/7w-2/9=4/9w+1/7

5. 1/2x+4=-2/3x+1/2

2 Answers

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  • Anonymous
    8 years ago
    Favorite Answer

    1. 4*(5/2)= 10

    2. 1/2

    3. 80/13

    4. 23

    5. -2.1

    Source(s): Math Nerd
  • MICHAEL K
    Lv 7
    8 years ago

    1. 2/5g = 4

    (5/2)2/5g = (5/2)4

    g = 10.

    2. 3(2x - 5) - x = - 7(x + 3)

    6x - 15 - x = - 7x - 21

    5x - 15 = - 7x - 21

    12x = - 6

    x = - 1/2.

    3. 1/5d + 1/8d = 2

    8/40d + 5/49d = 2

    13/40d = 2

    (40/13)13/40d = (40/13)2

    d = 80/13

    or

    d = 6 2/13.

    4. 3/7w - 2/9 = 4/9w + 1/7

    27/63w - 28/63w = 14/63 + 9/63

    - 1/63w = 23/63

    - (63/1)1/63w = (63/1)23/63

    - w = 23

    or

    w = - 23.

    5. 1/2x + 4 = - 2/3x + 1/2

    3/6x + 4/6x = - 4 + 1/2

    7/6x = - 3 1/2

    (6/7)7/6x = - (6/7)7/2

    x = - 3.

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