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    8n+12-5n=21

    0  Views: 1131 Answers: 2 Posted: 7 years ago

    2 Answers

    8n+12-5n=21


    8n-5n+12-21=0


    3n-9=0


    3n=9


    n=9/3


    n=3

    8n + 12 - 5n = 21


    combine like term


     8n - 5n = 3n


    3n + 12 = 21


    subtract 12 on both sides


    3n + 12 - 12 = 21 - 12


    3n = 9


    divide by 3 on both sides


    3n/3 = 9/3


    n = 3



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