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2z-14=4z-30
We move all terms to the left:
2z-14-(4z-30)=0
We get rid of parentheses
2z-4z+30-14=0
We add all the numbers together, and all the variables
-2z+16=0
We move all terms containing z to the left, all other terms to the right
-2z=-16
z=-16/-2
z=+8
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