Solve [[$ x $]] from the equation [[$ \displaystyle\frac {ax + b} {cx + d} = 3 $]], when

a) [[$ a = 2 $]], [[$ b = -3 $]], [[$ c = 0 $]], [[$ d = -5 $]].

b) [[$ a = 1 $]], [[$ b = 2 $]], [[$ c = 4 $]], [[$ d = 5 $]].

(Source: Finnish matriculation exam, spring 1999)

Take a picture of your solution and return it to the submission folder.

Solution