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-9z+6z=3z-8-4z
We move all terms to the left:
-9z+6z-(3z-8-4z)=0
We add all the numbers together, and all the variables
-9z+6z-(-1z-8)=0
We add all the numbers together, and all the variables
-3z-(-1z-8)=0
We get rid of parentheses
-3z+1z+8=0
We add all the numbers together, and all the variables
-2z+8=0
We move all terms containing z to the left, all other terms to the right
-2z=-8
z=-8/-2
z=+4
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