Question 912119
-{{{3/4}}}+{{{1/5}}}+{{{2/9}}}
First thing you want to do is find a common denominator.  Let's just multiply them all together -- we can reduce later.  4 * 5 * 9 = 180
Now convert
-{{{135/180}}}+{{{36/180}}}+{{{40/180}}}=
-{{{135/180}}}+{{{76/180}}}=
-{{{59/180}}} I don't think that can actually be reduced... so it's the final answer.