Question 744693
You might be asking for this:  {{{B=tv+7/(t-v)}}} OR you might be asking about this:  {{{B=(tv+7)/(t-v)}}}.  Which one?  


I will assume you want {{{B=(tv+7)/(t-v)}}} and solve for t.
{{{B(t-v)=tv+7}}}
{{{Bt-Bv=tv+7}}}
{{{Bt-tv-Bv=7}}}
{{{Bt-tv=Bv+7}}}
{{{t=(Bv+7)/(B-v)}}}