\(=\dfrac{91}{105}-\dfrac{101}{105}+\dfrac{4}{7}=-\dfrac{2}{21}+\dfrac{12}{21}=\dfrac{10}{21}\)
\(\dfrac{13}{15}\) + \(\dfrac{4}{7}\) - \(\dfrac{101}{105}\) = \(\dfrac{91}{105}\) + \(\dfrac{60}{105}\) - \(\dfrac{101}{105}\) = \(\dfrac{151}{105}\) - \(\dfrac{101}{105}\) = \(\dfrac{50}{105}\)
=91/105−101/105+4/7=−2/21+12/21=10/21