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31z+6.45=8z+23.75
We move all terms to the left:
31z+6.45-(8z+23.75)=0
We get rid of parentheses
31z-8z-23.75+6.45=0
We add all the numbers together, and all the variables
23z-17.3=0
We move all terms containing z to the left, all other terms to the right
23z=17.3
z=17.3/23
z=13.307692307692/17.692307692308
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