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22 July, 03:41

3x+7=13 (x=-2; x=2; x=5)

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Answers (2)
  1. 22 July, 04:17
    0
    3x + 7 = 13

    3x = 13 - 7

    3x = 6

    x = 6:3

    x = 2
  2. 22 July, 04:19
    0
    There are two sites of every equation. The sign = means that the two sites are equal.

    So, we know that 3x+7 is equal as 13. 3x+7=13

    In order to find the unknown x we should rewrite the equation such that on one site we have only x and on the other all left

    3x=13-7 ("+"is "-" on the other site of the equation)

    3x=6

    x multiplied with 3 gives 6, so we need to divide 6 with 3 in order to get the value of x.

    x=6/3=2
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