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7.9+1.8z=13
We move all terms to the left:
7.9+1.8z-(13)=0
We add all the numbers together, and all the variables
1.8z-5.1=0
We move all terms containing z to the left, all other terms to the right
1.8z=5.1
z=5.1/1.8
z=2+1/1.2
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