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3z/10=7
We move all terms to the left:
3z/10-(7)=0
We multiply all the terms by the denominator
3z-7*10=0
We add all the numbers together, and all the variables
3z-70=0
We move all terms containing z to the left, all other terms to the right
3z=70
z=70/3
z=23+1/3
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