\(\dfrac{13}{20}-\left(\dfrac{1}{4}-\dfrac{5}{20}\right)\)
\(=\dfrac{13}{20}-\dfrac{1}{4}+\dfrac{5}{20}\)
\(=\left(\dfrac{13}{20}+\dfrac{5}{20}\right)-\dfrac{1}{4}\)
\(=\dfrac{18}{20}-\dfrac{1}{4}\)
\(=\dfrac{9}{10}-\dfrac{1}{4}\)
\(=\dfrac{18}{20}-\dfrac{5}{20}\)
\(=\dfrac{18-5}{20}\)
\(=\dfrac{13}{20}\)
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=13/20-1/4+5/20
=9/10-1/4
=18/20-5/20
=13/20
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