Question

3x+9
-------- how do I solve this?
4x+12

Answer 1

Put common terms in evidence and simplify:

$\boxed{\frac{3x+9}{4x+12}=\frac{3(x+3)}{4(x+3)}=\frac{3}{4}}$

Answer 2

$Answer :$  $(3x+9)/(4x+12) \\ =3(x+3)/4(x+3) \\ =3/4 \\ (=0.75)$