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25=z+6.5
We move all terms to the left:
25-(z+6.5)=0
We get rid of parentheses
-z-6.5+25=0
We add all the numbers together, and all the variables
-1z+18.5=0
We move all terms containing z to the left, all other terms to the right
-z=-18.5
z=-18.5/-1
z=18+0.5/1
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