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223=408-z
We move all terms to the left:
223-(408-z)=0
We add all the numbers together, and all the variables
-(-1z+408)+223=0
We get rid of parentheses
1z-408+223=0
We add all the numbers together, and all the variables
z-185=0
We move all terms containing z to the left, all other terms to the right
z=185
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