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2.1z=6.3
We move all terms to the left:
2.1z-(6.3)=0
We add all the numbers together, and all the variables
2.1z-6.3=0
We move all terms containing z to the left, all other terms to the right
2.1z=6.3
z=6.3/2.1
z=3+-8.8817841970013E-16/2.1
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