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4z+17=9z+42
We move all terms to the left:
4z+17-(9z+42)=0
We get rid of parentheses
4z-9z-42+17=0
We add all the numbers together, and all the variables
-5z-25=0
We move all terms containing z to the left, all other terms to the right
-5z=25
z=25/-5
z=-5
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