\(1-\dfrac{6}{9}+\dfrac{7}{12}=\dfrac{3}{9}+\dfrac{7}{12}=\dfrac{36+63}{108}=\dfrac{99}{108}\)
\(1+\dfrac{8}{5}-\dfrac{4}{2}=\dfrac{5+8}{5}-\dfrac{4}{2}=\dfrac{13}{5}-\dfrac{4}{2}=\dfrac{26-20}{10}=\dfrac{6}{10}\)
1-6/9+7/12
=1/3+ 7/12
=11/12
1+8/5-4/2
=13/5- 4/2
=3/5
\(\dfrac{99}{108}\)
\(\dfrac{6}{`10}\)