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18=2z+4
We move all terms to the left:
18-(2z+4)=0
We get rid of parentheses
-2z-4+18=0
We add all the numbers together, and all the variables
-2z+14=0
We move all terms containing z to the left, all other terms to the right
-2z=-14
z=-14/-2
z=+7
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