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z/7-5=-1
We move all terms to the left:
z/7-5-(-1)=0
We add all the numbers together, and all the variables
z/7-4=0
We multiply all the terms by the denominator
z-4*7=0
We add all the numbers together, and all the variables
z-28=0
We move all terms containing z to the left, all other terms to the right
z=28
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