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4z+15=9z-20
We move all terms to the left:
4z+15-(9z-20)=0
We get rid of parentheses
4z-9z+20+15=0
We add all the numbers together, and all the variables
-5z+35=0
We move all terms containing z to the left, all other terms to the right
-5z=-35
z=-35/-5
z=+7
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