First you would subtract 5x/8 from both sides so that you isolate x. to do that, find the common denominator of both fractions (15x/24 and 16x/24) and then subtract into get 1x/24. from there, you would multiply both sides by the reciprocal, or 24, to isolate x. that would be -8(24) = x, which is -192. therefore, x = -192.
i don’t know if this is right or not, but i hope it helped somehow!