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-9.72-2.8z=7z+8.9
We move all terms to the left:
-9.72-2.8z-(7z+8.9)=0
We get rid of parentheses
-2.8z-7z-8.9-9.72=0
We add all the numbers together, and all the variables
-9.8z-18.62=0
We move all terms containing z to the left, all other terms to the right
-9.8z=18.62
z=18.62/-9.8
z=-1+4.8461538461538/5.3846153846154
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