Solve for c
c=3.9
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c=\frac{7.8}{2}
Divide both sides by 2.
c=\frac{78}{20}
Expand \frac{7.8}{2} by multiplying both numerator and the denominator by 10.
c=\frac{39}{10}
Reduce the fraction \frac{78}{20} to lowest terms by extracting and canceling out 2.
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