Answer:
z = 2
Step-by-step explanation:
z × 3 × 0.5=3
<=> z × 3 × 1/2 = 3
<=> (z × 3 × 1/2) : 3 = 3 : 3
<=> z × 1/2 = 1
<=> z = 1 : 1/2
=> z = 1 × 2 = 2