Answers,
X = 24
Z = 4
Explanation One,
Step 1. Add "3"to both sides,
1/4x - 3 + 3 = 3 +3
1/4x = 6
Step 2. Multiply both sides by "4"
4 * (1/4x) = 4 * 6
x = 24
Explanation Two,
Step 1. Simplify both sides of the eqation,
3z + 2 = 14
Step 2. Subtract "2" from both sides
3z + 2 -2 = 14 - 2
3z = 12
Step 3. Divide both sides by "3"
3z/3 = 12/3
Z = 4
Hope this helps :-)