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Math Help - help solve equation

  1. #1
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    help solve equation

    when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number.
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  2. #2
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    Quote Originally Posted by blame_canada100 View Post
    when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number.
    7*x - 8 = 3*x + 4

    Solve for x;

    4*x = 12

    x = 3
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  3. #3
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    Quote Originally Posted by blame_canada100 View Post
    when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number.
    In other words:
    Quote Originally Posted by blame_canada100 View Post
    7n-8=3n+4
    That's your equation, therefore when you subtract both sides by 3n you get: 4n-8=4

    Add 8 to both sides to get: 4n=12

    divide by 4: n=3
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