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81=6-5z
We move all terms to the left:
81-(6-5z)=0
We add all the numbers together, and all the variables
-(-5z+6)+81=0
We get rid of parentheses
5z-6+81=0
We add all the numbers together, and all the variables
5z+75=0
We move all terms containing z to the left, all other terms to the right
5z=-75
z=-75/5
z=-15
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