math algebra

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not sure about this can someone please help me
solve for x using the addition principle


Now I added 10 to both sides 10 + 10 that gives me 20
then I added -13 +10 = -3

my x is the 20 or did I mess this problem up all the way around?

  • math algebra -

    You need to subtract (not add) 10 to both sides of the equation. The purpose is to get the unknown quantity on one side and the known quantity on the other side.

    x + 10 - 10 = -13 + (-10)
    x = -23

  • math algebra -

    you -10 from both sides not add
    [do the opposite]
    so x=-23

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