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z/3-6=7
We move all terms to the left:
z/3-6-(7)=0
We add all the numbers together, and all the variables
z/3-13=0
We multiply all the terms by the denominator
z-13*3=0
We add all the numbers together, and all the variables
z-39=0
We move all terms containing z to the left, all other terms to the right
z=39
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