Simplify: (2/3)+(5/6)-(1/9)
LCM of $$3,6,9=18$$
Now let us change each of the given fraction into an equivalent fraction having $$18$$ as the denominator.
$$(2/3)x(6/6)=(12/18)$$
and $$(5/6)x(3/3)=(15/18)$$
and $$(1/9)x(2/2)=(2/18)$$
Now,
$$=(12/18)+(15/18)-(2/18)$$
$$=(12+15-2)/18$$
$$=(27-2)/18$$
$$=(25/18)$$
$$=[1(7/18)]$$