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how do you solve this equation: 12n=9(n+10)

  • math -

    12n=9(n+10)

    12n = 9n + 90
    12n - 9n = 9n - 9n + 90
    3n = 90
    n = ?

  • math -

    12n=9(n+10)
    remove parentheses
    12n = 9n+90
    Move unknown (n) to the same side by subtracting 9n from both sides.
    12n-9n = 9n-9n+90
    combine terms.
    3n=90
    divide both sides by 3.
    3n/3 = 90/3
    n=?

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