Solve for c
c=\frac{17}{20}=0.85
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-\frac{5}{4}+c=-\frac{2}{5}
Swap sides so that all variable terms are on the left hand side.
c=-\frac{2}{5}+\frac{5}{4}
Add \frac{5}{4} to both sides.
c=-\frac{8}{20}+\frac{25}{20}
Least common multiple of 5 and 4 is 20. Convert -\frac{2}{5} and \frac{5}{4} to fractions with denominator 20.
c=\frac{-8+25}{20}
Since -\frac{8}{20} and \frac{25}{20} have the same denominator, add them by adding their numerators.
c=\frac{17}{20}
Add -8 and 25 to get 17.
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