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z/9+7=19
We move all terms to the left:
z/9+7-(19)=0
We add all the numbers together, and all the variables
z/9-12=0
We multiply all the terms by the denominator
z-12*9=0
We add all the numbers together, and all the variables
z-108=0
We move all terms containing z to the left, all other terms to the right
z=108
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