Answer
$Al(OH)_3 + 3HCl$-->$AlCl_3+3H_2O$
Work Step by Step
For the balancing of the equation we will initially balance the coefficients of the Cl, adding 3 to the HCl. Note that hydrogen and oxygen are not yet balanced, for this the coefficient of water will be 3.
Finally, our equation is balanced as follows:
$Al(OH)_3 + 3HCl$-->$AlCl_3+3H_2O$