change the subject of the formula

Question

make x the Subject of the formula

 y = 1/2 x + 1 
-1 from both sides
y-1=1/2 x
÷ by 1/2 from both sides
y-1 over a 1/2 = x

Answer 1

y-1
_______
(1/2)

is the same as
2(y-1) /1
or
2y-2