Hi there!
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I believe your answer is:
[tex]c = - 22[/tex]
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Here’s why:
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[tex]\boxed{\text{Solving for 'c'...}}\\\\-7 = -c-29\\-------------\\\rightarrow -c -29 = -7\\\\\rightarrow -c - 29 + 29 = -7 + 29\\\\\rightarrow -c = 22\\\\\rightarrow\frac{-c=22}{-1}\\\\\rightarrow \boxed{c = -22}[/tex]
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Hope this helps you. I apologize if it’s incorrect.