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-3z-13.89=-2.68
We move all terms to the left:
-3z-13.89-(-2.68)=0
We add all the numbers together, and all the variables
-3z-11.21=0
We move all terms containing z to the left, all other terms to the right
-3z=11.21
z=11.21/-3
z=-3+2.21/3
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