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-3z-9-5z=-3z-4
We move all terms to the left:
-3z-9-5z-(-3z-4)=0
We add all the numbers together, and all the variables
-8z-(-3z-4)-9=0
We get rid of parentheses
-8z+3z+4-9=0
We add all the numbers together, and all the variables
-5z-5=0
We move all terms containing z to the left, all other terms to the right
-5z=5
z=5/-5
z=-1
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