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-28=-5z+2
We move all terms to the left:
-28-(-5z+2)=0
We get rid of parentheses
5z-2-28=0
We add all the numbers together, and all the variables
5z-30=0
We move all terms containing z to the left, all other terms to the right
5z=30
z=30/5
z=6
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