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6.8+2z=2.2
We move all terms to the left:
6.8+2z-(2.2)=0
We add all the numbers together, and all the variables
2z+4.6=0
We move all terms containing z to the left, all other terms to the right
2z=-4.6
z=-4.6/2
z=-2+0.6/2
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