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86=5z+31
We move all terms to the left:
86-(5z+31)=0
We get rid of parentheses
-5z-31+86=0
We add all the numbers together, and all the variables
-5z+55=0
We move all terms containing z to the left, all other terms to the right
-5z=-55
z=-55/-5
z=+11
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