Question

x-2y=7 for y

Answer 1

you have to isolate y
keep y on one side and bring all other terms to the opposite side

Answer 2

First step is to subtract x from both sides
can you do it?

Answer 3

so it will be 2y-x=7

Answer 4

It would be easier to make it into
x=2y+7
Then, x-7=2y
\[y=\frac{ x-7 }{ 2 }\]