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9z/5=-81
We move all terms to the left:
9z/5-(-81)=0
We add all the numbers together, and all the variables
9z/5+81=0
We multiply all the terms by the denominator
9z+81*5=0
We add all the numbers together, and all the variables
9z+405=0
We move all terms containing z to the left, all other terms to the right
9z=-405
z=-405/9
z=-45
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