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JUSTIFIES A STEP IN THE SOLUTION OF AN EQUATION
4n+(7+n)=52
4n+(n+7)=52
(4n+n)+7=52
5n+7=52
5n+7-7=52
5n=45
5n/5=45/9
n=9

  • math -

    Oh my ....

    necessary steps:

    4n+(7+n)=52
    4n + 7 + n = 52
    5n + 7 = 52
    5n = 52-7
    5n = 45
    n = 9


    Your 4th last line should have been
    5n+7-7 = 52-7 , ( remember "whatever you do to one side, you must do to the other". You didn't )

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