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3.5z=2.2z-15.86
We move all terms to the left:
3.5z-(2.2z-15.86)=0
We get rid of parentheses
3.5z-2.2z+15.86=0
We add all the numbers together, and all the variables
1.3z+15.86=0
We move all terms containing z to the left, all other terms to the right
1.3z=-15.86
z=-15.86/1.3
z=-12+0.26/1.3
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