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(+4)+16=Z
We move all terms to the left:
(+4)+16-(Z)=0
We add all the numbers together, and all the variables
-Z+16+4=0
We add all the numbers together, and all the variables
-1Z+20=0
We move all terms containing Z to the left, all other terms to the right
-Z=-20
Z=-20/-1
Z=+20
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