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2z+9.75-7z=5
We move all terms to the left:
2z+9.75-7z-(5)=0
We add all the numbers together, and all the variables
-5z+4.75=0
We move all terms containing z to the left, all other terms to the right
-5z=-4.75
z=-4.75/-5
z=2.71428571429/2.85714285714
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