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28=5z-12
We move all terms to the left:
28-(5z-12)=0
We get rid of parentheses
-5z+12+28=0
We add all the numbers together, and all the variables
-5z+40=0
We move all terms containing z to the left, all other terms to the right
-5z=-40
z=-40/-5
z=+8
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