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z/7+21=34
We move all terms to the left:
z/7+21-(34)=0
We add all the numbers together, and all the variables
z/7-13=0
We multiply all the terms by the denominator
z-13*7=0
We add all the numbers together, and all the variables
z-91=0
We move all terms containing z to the left, all other terms to the right
z=91
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