Answer :

[tex]\frac{3ax+2b}{c}=4d\ \ \ \ \ \ |multiply\ both\ sides\ by\ "c"\\\\3ax+2b=4cd\ \ \ \ \ \ |subtract\ 2b\ from\ both\ sides\\\\3ax=4cd-2b\ \ \ \ \ \ |divide\ both\ sides\ by\ 3a\\\\\boxed{x=\frac{4cd-2b}{3a}}[/tex]