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Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals" etc. And using ^ to indicate powers (eg x-squared = x^2).

I am guessing you meant if 2x equals 15. First, to solve the equation, divide both sides by 2. So x equals 7.5.

Now substituting for x in 3x-4, we multiply 3 by 7.5 and get 22.5. Finally, we subtract 4 to get the answer: 18.5

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12y ago
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Q: What is the value of 3x-4 if2x 15?
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