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3z=-12/2
We move all terms to the left:
3z-(-12/2)=0
We add all the numbers together, and all the variables
3z-(-6)=0
We add all the numbers together, and all the variables
3z+6=0
We move all terms containing z to the left, all other terms to the right
3z=-6
z=-6/3
z=-2
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