Find the value of x which satisfies the following equation $$4log_7 (x - 8) = log_3 81$$
                  $$4log_7 (x - 8) = log_3 81$$
                   $$4log_7 (x - 8) = log_3 3^{4}$$
                   $$4log_7 (x - 8) =4*log_3 3$$
                    $$log_7 (x - 8) =1$$
                     $$(x - 8) =7^{1}$$
                      $$x = 7+8$$
                       $$x = 15$$
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