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