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2(z-3)=13
We move all terms to the left:
2(z-3)-(13)=0
We multiply parentheses
2z-6-13=0
We add all the numbers together, and all the variables
2z-19=0
We move all terms containing z to the left, all other terms to the right
2z=19
z=19/2
z=9+1/2
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