Make a a\,a the subject of v=u+atv = u + atv=u+at
Hence make x x\,x the subject of v=u+(x−b)tv = u + (x-b)tv=u+(x−b)t
210 exam-style questions on Eduqas GCSE Maths Changing the Subject of a Formula. Each one has a worked solution and a mark scheme showing where the marks go.