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z/7-9=-7
We move all terms to the left:
z/7-9-(-7)=0
We add all the numbers together, and all the variables
z/7-2=0
We multiply all the terms by the denominator
z-2*7=0
We add all the numbers together, and all the variables
z-14=0
We move all terms containing z to the left, all other terms to the right
z=14
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