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z/20=-9
We move all terms to the left:
z/20-(-9)=0
We add all the numbers together, and all the variables
z/20+9=0
We multiply all the terms by the denominator
z+9*20=0
We add all the numbers together, and all the variables
z+180=0
We move all terms containing z to the left, all other terms to the right
z=-180
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