Bereken
\(-\left(\frac{9}{-7}\right)
-\left(\frac{10}{-9}\right)
+\left(\frac{12}{5}\right)\)
\(-\left(\frac{9}{-7}\right)
-\left(\frac{10}{-9}\right)
+\left(\frac{12}{5}\right)\\= \frac{9}{7}+
\frac{10}{9}+\frac{12}{5}\\=\frac{405}{315}+\frac{350}{315}+\frac{756}{315}\\=\frac{405+350+756}{315}\\=\frac{1511}{315}\)