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6z-6.9=5z-8.6
We move all terms to the left:
6z-6.9-(5z-8.6)=0
We get rid of parentheses
6z-5z+8.6-6.9=0
We add all the numbers together, and all the variables
z+1.7=0
We move all terms containing z to the left, all other terms to the right
z=-1.7
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