Answer
$Ca_{}(O_{}H_{})_{2}$ --> $Ca_{}O_{}$ + $H_{2}O_{}$
Work Step by Step
1. Write the decomposition of Calcium Hydroxide equation:
*Calcium Hydroxide: $Ca_{}(O_{}H_{})_{2}$
*Calcium Oxide: $Ca_{}O$
$Ca_{}(O_{}H_{})_{2}$ --> $Ca_{}O_{}$ + $H_{2}O_{}$
2. Because both sides have the same amount of each atom, we consider that the equation is balanced.