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15=6z-9
We move all terms to the left:
15-(6z-9)=0
We get rid of parentheses
-6z+9+15=0
We add all the numbers together, and all the variables
-6z+24=0
We move all terms containing z to the left, all other terms to the right
-6z=-24
z=-24/-6
z=+4
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