Answer
z=$\frac{9}{4}$
Work Step by Step
$12=4z+3$
$4z+3=12$
First subtract 3 from both sides.
$4z=12-3$
$4z=9$
Then divide both sides by 4.
4z$\div$4=9$\div$4
z=$\frac{9}{4}$
Check the answer.
12=4($\frac{9}{4}$)+3
12=9+3
12=12