The spaces as you seem to use are not working right for you. With the expression in pure text as I showed, put triple left curly braces and triple right curly bracess, each looking like { and }.
The equation will then look like: ;
The braces make the site render into mathematical notation.
The equation when simplified will become a linear equation. Multiply both members by 4(x+3). This will immediately give , combined steps which you hopefully understand;
You do not solve that; you obtain a linear equation in two variables. This is shown in slope-intercept form, but you can adjust it into whichever form you want or need.