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9=2z-15
We move all terms to the left:
9-(2z-15)=0
We get rid of parentheses
-2z+15+9=0
We add all the numbers together, and all the variables
-2z+24=0
We move all terms containing z to the left, all other terms to the right
-2z=-24
z=-24/-2
z=+12
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