I assume that it's w that you want to know.
We'd want w to be alone on one side, we need to get rid of the 8 and the minus by multiplying the whole equation by -8:
\(- \frac{6}{8} =-(-( \frac{w*8}{8} )\)
which is:
\(- \frac{3}{4} ={w}\)
So we know that w is equal to \(- \frac{3}{4}\)