Question 81598
First solve for x using the equation:
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{{{(-1/3)x + 7 = 16}}}
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Subtract 7 from both sides to get:
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{{{(-1/3)x = 9}}}
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Then get x by itself on the left side by multiplying both sides by -3. When you do that 
multiplication the equation becomes:
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{{{x = -27}}}
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Now that you know the value of x from the first equation, you can substitute that value into
the expression {{{2x + 1}}} to get the answer to your question. When you do the substitution
the expression becomes:
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{{{2*(-27) + 1 = -54 + 1 = -53}}}
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The answer to this problem is -53 which means that answer C is correct.
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Hope this helps you to understand the problem.
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