Question 62339

{{{6c - t/7 = b  }}}  Add t/7 to both sides of the equation
{{{6c - t/7 + t/7 = b + t/7  }}}
{{{6c = b + t/7  }}}   Divide both sides of the equation by 6
{{{6c / 6 = (b + t/7) /6  }}} 
{{{c = b / 6 + t / 42}}}