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