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9+4z=-5z-9
We move all terms to the left:
9+4z-(-5z-9)=0
We get rid of parentheses
4z+5z+9+9=0
We add all the numbers together, and all the variables
9z+18=0
We move all terms containing z to the left, all other terms to the right
9z=-18
z=-18/9
z=-2
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