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12.2z+19.4=2.72=93.9
We move all terms to the left:
12.2z+19.4-(2.72)=0
We add all the numbers together, and all the variables
12.2z+16.68=0
We move all terms containing z to the left, all other terms to the right
12.2z=-16.68
z=-16.68/12.2
z=-1+1/2.7232142857143
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