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6.7z-18.37=10z+31.79
We move all terms to the left:
6.7z-18.37-(10z+31.79)=0
We get rid of parentheses
6.7z-10z-31.79-18.37=0
We add all the numbers together, and all the variables
-3.3z-50.16=0
We move all terms containing z to the left, all other terms to the right
-3.3z=50.16
z=50.16/-3.3
z=-15+0.66/3.3
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