The equation that we have to solve is:
[tex]u\text{ = }\frac{2x-6}{y}[/tex]
I will use the multiplication property which consists in getting the 'y' and passing him to the other side multiplicated by 'u'.
[tex]u\times y\text{ = }2x-6[/tex]
Now I will isolate x, passing 6 to the other side:
[tex]2x\text{ = uy + 6}[/tex]
And finally, I will use the division property to definitely isolate x:
[tex]x\text{ = }\frac{uy+6}{2}[/tex]
