Answer:
9z-3z+3=15
Explanation:
move variable to the left hand side
Subtract 3z from each side
9z+3=3z+15
9z-3z+3=3z-3z+15
6z +3 = 15
Subtract 3 from each side
6z+3-3 = 15-3
6z = 12
Divide by 6
6z/6 = 12/6
z=2
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