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-1z-6+4z+1-7z=-1
We move all terms to the left:
-1z-6+4z+1-7z-(-1)=0
We add all the numbers together, and all the variables
-4z-4=0
We move all terms containing z to the left, all other terms to the right
-4z=4
z=4/-4
z=-1
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