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z/10+8=9
We move all terms to the left:
z/10+8-(9)=0
We add all the numbers together, and all the variables
z/10-1=0
We multiply all the terms by the denominator
z-1*10=0
We add all the numbers together, and all the variables
z-10=0
We move all terms containing z to the left, all other terms to the right
z=10
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