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30 June, 13:54

1. 3 (5 - 2x) = - 2 (6 - 3x) - 10x

2. 1/4x - 2/5x = 39

3. 115 = 20 + 2.5x

4. 0.7x - 0.2 = 8.3x + 7.2

x = - 260

x = - 37/38

x = 38

x = 13.5

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Answers (1)
  1. 30 June, 14:10
    0
    1.) 3 (5 - 2x) = - 2 (6 - 3x) - 10x

    15 - 6x = - 12 + 6x - 10x

    -6x - 6x + 10x = - 12 - 15

    -2x = - 27

    x = - 27/-2 = 13.5

    x = 13.5

    2.) 1/4x - 2/5x = 39

    -3/20x = 39

    x = (39 x 20) / - 3 = - 260

    x = - 260

    3.) 115 = 20 + 2.5x

    2.5x = 115 - 20 = 95

    x = 95/2.5 = 38

    x = 38

    4.) 0.7x - 0.2 = 8.3x + 7.2

    8.3x - 0.7x = - 0.2 - 7.2 = - 7.4

    7.6x = - 7.4

    x = - 7.4/7.6 = - 37/38

    x = - 37/38
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Home » Mathematics » 1. 3 (5 - 2x) = - 2 (6 - 3x) - 10x 2. 1/4x - 2/5x = 39 3. 115 = 20 + 2.5x 4. 0.7x - 0.2 = 8.3x + 7.2 x = - 260 x = - 37/38 x = 38 x = 13.5
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