Question 928693
make it clear with an example...I am not quite sure what do you need.

here is what I think you asking for:

how do I get {{{y}}} by itself?

{{{x+3y=6}}}

Subtract {{{x}}} from both sides to get:
{{{3y = -x+6}}}

Divide thru by {{{3}}} to get:

{{{y = (-1/3)x + 2}}}