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OpenStudy (anonymous):
7(c-9)=9(2c-8)+4c
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OpenStudy (anonymous):
multiply the 7 and the 9 into their respective parenthesis
OpenStudy (anonymous):
\[7c - 63 = 18c - 72 + 4c\] just simplify that, not gonna do all the work for you
OpenStudy (anonymous):
you should get \[c=\frac{3}{5}\] when you are done
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