Question

Avoltaic cell consists of an Al/Al3+ half-cell and a Ag/Ag+ half-cell. Calculate {Ag+} when {Al3+} = 0.795 M and Ecell = 2.411 V. Use reduction potential values of Al3+ = -1.66 V and for Ag+ = +0.80 V

The answer is 0.138 but I can't figure out the steps