Solve for k
k=\frac{7}{10}=0.7
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k=\frac{2}{5}+\frac{3}{10}
Add \frac{3}{10} to both sides.
k=\frac{4}{10}+\frac{3}{10}
Least common multiple of 5 and 10 is 10. Convert \frac{2}{5} and \frac{3}{10} to fractions with denominator 10.
k=\frac{4+3}{10}
Since \frac{4}{10} and \frac{3}{10} have the same denominator, add them by adding their numerators.
k=\frac{7}{10}
Add 4 and 3 to get 7.
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Limits
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