Question 331641
 {{{ 7 * 5^x = 4 * 8^x }}} = {{{7/4 =8^x/5^x = (8/5)^x}}}

{{{ln(7/4)= ln(8/5)^x}}}

{{{ln(7/4) = x*ln(8/5)}}}

{{{ln(7/4)/ln(8/5) =x}}}

1.191=x