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3z-12z+4=16-28
We move all terms to the left:
3z-12z+4-(16-28)=0
We add all the numbers together, and all the variables
3z-12z+4-(-12)=0
We add all the numbers together, and all the variables
-9z+16=0
We move all terms containing z to the left, all other terms to the right
-9z=-16
z=-16/-9
z=1+7/9
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