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4z/7-9=1
We move all terms to the left:
4z/7-9-(1)=0
We add all the numbers together, and all the variables
4z/7-10=0
We multiply all the terms by the denominator
4z-10*7=0
We add all the numbers together, and all the variables
4z-70=0
We move all terms containing z to the left, all other terms to the right
4z=70
z=70/4
z=17+1/2
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