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z-31.3=17.6z-31.3=17.6+31.3
We move all terms to the left:
z-31.3-(17.6z-31.3)=0
We get rid of parentheses
z-17.6z+31.3-31.3=0
We add all the numbers together, and all the variables
-16.6z=0
z=0/-16.6
z=0
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